This was the only television series endorsed and supported by the United States Armed Forces (particularly the Air Force).

Michael Shanks (Dr. Daniel Jackson) has a fear of spiders (arachnophobia), so when shooting the episodes with the replicator spiders, he insisted on wearing a blindfold when the props were on-set, if not, he was likely to get uncontrollable shakes, resulting in a delayed schedule.

Unusual for a series, Showtime ordered forty-four episodes (a second season) before showing the pilot. Halfway through the first season, they ordered another forty-four episodes.

99942 Apophis is a large asteroid that was named in 2005 by astronomers David Tholan and Roy Tucker, both fans of this show. At one time, there was concern that 99942 Apophis might strike the Earth, causing widespread devastation in 2029. However, later analysis says that it will miss.

Although the SGC is a fictional location, its home base at the Cheyenne Mountain Complex is a real-life Air Force facility. The exterior shot of the main entrance tunnel to the mountain base is the actual entrance, and the blast doors (seen closing in any episode which features the SGC going into Lockdown) do exist at the facility in real-life.

Christopher Judge (Teal'c) and Amanda Tapping (Samantha Carter) are the only cast members to stay with the series throughout its entire run, and consequently, to appear in two hundred or more episodes.

The character "Jack O'Neill" was ranked number ten in TV Guide's list of the "25 Greatest Sci-Fi Legends" (August 1, 2004 issue).

Running for ten seasons, the show held the record for longest-running American live-action science fiction television series, until it was surpassed by Supernatural (2005).

The Asgard were voiced by creative staff, cast, and crew of the show. Thor was voiced by Michael Shanks, Heimdall was voiced by Teryl Rothery; and Loki and new Asgard Kvasir, were voiced by Peter DeLuise.

Certain concepts of Stargate travel were phased out over the course of the first season, such as the travellers feeling extremely cold, and arriving with frost on their faces. Also, the concept of the travellers unable to keep their balance and always tumbling out of the Stargate (unless, of course, they tumbled into the Stargate to begin with). This was explained within the show as a result of more precise dialing of the Earth Stargate, and sometimes these effects are brought back, when the wormhole is disturbed during transit.

Dan Shea (Siler) was also the Stunt Coordinator for the show.

The prop used to portray the device, which controls the Tok'ra memory recall device, which looks like a "wand", is actually an electric nose hair trimmer, and is used unaltered.

Peter DeLuise directed, wrote, and produced numerous episodes, and was creative consultant for nearly all of them. Many times, he found a way to appear in front of the camera (à la Alfred Hitchcock). He has played several airmen and villagers, "man leaving café", "shouting Jaffa", and even a younger, more handsome version of a character played by his father, Dom DeLuise. Peter's brother, Michael DeLuise, played the role of "Replacement Actor" on season ten, episode six, "200".

According to Carter (Amanda Tapping) in season six, the Stargate, made from Naquadah, weighed sixty-four thousand pounds (roughly twenty-nine metric tons). The primary on-set Stargate prop was made out of steel and fiberglass though, and was twenty-two feet (6.7 meters) in diameter. It was fully automated, and capable of rotating and emitting light. This was achieved by the use of a specially-designed twenty-two foot (6.7 meter) circular gear, which turned the inner ring on a precise pinion drive wheel, using an eight horsepower electric motor.

Christopher Judge (Teal'c) appeared in two hundred twelve of the series' two hundred thirteen episodes, being absent only from Stargate SG-1: Prometheus Unbound (2004). In second place is Amanda Tapping (Samantha Carter) who appeared in a total of two hundred seven episodes.

Sergeant Walter Harriman was loosely based on Walter "Radar" O'Reilly from M*A*S*H (1972). Throughout the series, we see Walter display many Radar-like qualities, particularly his ability to respond the requests of his superiors before being asked. Coincidentally, both characters were portrayed by actors named Gary.

Apophis was a "real" Egyptian god, despite many fans' difficulty in finding any information on him. "Apophis" is an obscure Greek name for Apep, the Egyptian god of darkness and night. The native names of Egyptian deities are not widely known, except to Egyptologists, because most Egyptian mythology was brought to the Western world by the Greeks, who altered Egyptian words and names to conform to Greek phonology. For example, the name of Bast, the cat-god, was probably pronounced something like "Pasht" or "Bast" (the latter according to Gardiner's "Egyptian Grammar").

The series had four different opening credits sequences. The first is the original non-clip version, which was used for the premiere and Showtime airings of the show. It was based on the Stargate (1994) movie opening credits, panning around a statue of Ra. The second opening credits sequence and set was the one used for syndicated airings. It includes clips from the series. The third opening credits sequence was used on the Syfy Channel. It is similar to the first sequence, though not showing clips, but pans in and out on an activating Stargate. It ends showing SG-1, from the back and in a row of four, entering the Stargate. The fourth version appeared on episodes during the first half of the ninth season. It shows a stargate floating in space, and footage of SG-1 walking towards the stargate at the SGC. The stargate then becomes active, and the camera goes into the stargate, showing the footage used for travelling trough the stargate. The third version of the credits returned for the second half of season nine.

Several elements and characters from Stargate (1994) also appeared throughout the series, and although some retained their original characteristics, many have been changed or altered entirely. Here are some of the primary differences between movie and show: -Aside from the obvious difference in the actors playing the characters, the character Sha'uri from the movie appeared several times in the series, but her name on the show was Sha're. -In the movie, Colonel O'Neil's name was spelled with one L, but in the series, it's spelled with two Ls (which O'Neill himself emphasizes on a couple of occasions). -Colonel O'Neill's son was named Tyler in the movie (his name could be seen on various awards hanging on the wall of his room), but in the series, his name was Charlie. -The Stargate was located inside a military installation inside Creek Mountain in the movie, but in the series, it was located at the military installation inside the Cheyenne Mountain Complex. -The planet Abydos was supposedly located "on the other side of the known universe" in the fictional Kaliam galaxy, millions of light years away, but in the television series, it is located inside our own Milky Way galaxy, and said to be the nearest planet to Earth with a working Stargate. -In the movie, each Stargate had a distinct set of symbols (represented by star constellations on Earth's gate), which differed from gate to gate. In the series however, each of the symbols on each of the gates are very similar, with the point of origins being the only unique symbols for each gate. -The wormhole effect for the Stargate was different in the movie and the series. In the movie, the effect appeared as a spinning vortex coming out from behind the gate. However, this was absent from the series.

In several episodes, Carter can be seen using a scanning device, that is in actuality, an unaltered Philips "Pronto" universal remote control. The half moon shaped section at the top is the infrared emitter.

Richard Dean Anderson, Michael Shanks, Amanda Tapping, Christopher Judge, Don S. Davis, Gary Jones, and Dan Shea are the only cast members to appear in all ten seasons.

Despite being injured on many missions during his military career, all of which are mentioned by the character, Jack O'Neill wears many ribbons, but no Purple Heart Ribbon (combat related injury) on his Class A/B Uniform.

Michael Shanks (Daniel Jackson), Amanda Tapping (Samantha Carter), Christopher Judge (Teal'c) and Gary Jones (Walter Harriman) are the only actors to appear in both the first and the last episodes of the series: Stargate SG-1: Children of the Gods (1997) and Stargate SG-1: Unending (2007).

Alexis Cruz (Skaara) and Erick Avari (Kasuf) are the only actors to appear in both Stargate (1994) and Stargate SG-1 (1997).

The "Tollan Homeworld" shows were shot at Simon Fraser University.

The large device that is sent through the Stargate prior to each mission is called a M.A.L.P. M.A.L.P. stands for "Mobile All-Terrain Laboratory Platform".

Major Carter always had a Volvo as her personal car throughout the run of the series, from a vintage 1800 model, to a then-new model S60 sedan.

The character of Sergeant Walter Harriman was created without the name in the beginning of the series. His rank was possible to determine, due to markings on the uniform. Firstly, General Hammond referred to him as "Airman", which was mistakenly heard as Harriman by fans of the show. The name Walter was added later on. Harriman's original name was supposed to be "Walter Davis". However, it was changed by the show's producers later on, after it was discovered there was an actual person named Walter Davis enlisted in the U.S. Air Force.

Daniel Jackson's birthday is July 8, 1965. In season two, episode twenty-one, "1969", Jackson tells O'Neill that he was four and a half years old in 1969, and in season three, episode ten, "Forever in a Day", he tells Sha'Re and Dr. Frasier that his birthday was July 8th.

Each planet and moon with a Stargate, is designated with a six-digit designation (for example, P3X-989), with the first digit always being a P, an M, a K, or an X.

It was originally planned to end the series after seven seasons, and make a feature film, which would be the show's finale. But the show's ratings on Syfy led to it being renewed for an eighth season, and the film turned into the seventh season two-parter "The Lost City".

Many actors and actresses associated with Star Trek have had been on the show, including Armin Shimerman, Rene Auberjonois, John de Lancie, Robert Picardo, Dwight Schultz, Jolene Blalock, and John Billingsley.

The characters mention that the Stargate has thirty-nine symbols, seven glyphs, or chevrons, being necessary for any travel across the galaxy. Applying mathematical combinatorics, the number of unique permutations (and therefore gate addresses) without re-using any symbols to locate other planet or starship is 77,519,922,480. If symbols can be used more than once in an address, the number jumps to 137,231,006,679. For comparison, there are an estimated four hundred billion stars in the Milky Way galaxy. In effect, the design of the Stargate network could reach less than half the star systems in the Milky Way, and far less than half the planets. In addition, using eight glyphs for an address (extragalactic voyage), a stargate can locate 2,480,637,519,360 places throughout the universe, increased to 5,352,009,260,481, if one or more glyphs can be re-used. For comparison, there are an estimated one hundred billion galaxies in the universe. In effect, the design of the Stargate network could reach any galaxy, but less than one thousandth of the star systems, counting all them of all galaxies.

Although they wrote the original movie, on which the series was based, Dean Devlin and Roland Emmerich refused an on-screen credit. They are credited, however, in the series of novels based on the series.

Peter DeLuise tries to work the name "Penhall" into every script he directs. This was the last name of his character from 21 Jump Street (1987). In season seven, episode seven, "Enemy Mine", a Colonel calls out to two soldiers, Hanson and Penhall. Hanson was the name of Johnny Depp's character.

The stargate's ring had thirty-nine glyphs, or chevrons. The number of glyphs on a stargate, depends on the galaxy where this stargate belongs.

"Jonas Quinn" is from the country Kelowna on the planet Langara. Langara is a golf course, where some of the producers and directors went to play golf. Kelowna is a town near Vancouver, British Columbia, where the show was filmed.

The second longest running science fiction television series.

Jack's awards are: The two badges are Master Parachutist; and Master Space and Missile Command. His medals and ribbons (reading from the viewer's left to right and top to bottom): Defense Distinguished Service Medal, Distinguished Service Medal, Defense Superior Service Medal, Airman's Medal, Defense Meritorious Service Medal, Meritorious Service Medal, Air Medal, Aerial Achievement Medal, Joint Service Commendation Medal, Air Force Commendation Medal, Air Force Achievement Medal, Air Force Outstanding Unit Award, Air Force Organizational Excellence Award, Combat Readiness Medal, National Defense Service Medal, Vietnam Service Medal, South West Asia Service Medal, Air Force Overseas Ribbon - Long Tour, Air Force Longevity Service Ribbon, Republic of Vietnam Campaign Medal, and Kuwait Liberation Medal - Saudi Arabia. (Note that he does not wear pilot's wings of any level.)

At one point of Stargate (1994), Jackson explained to the staff of the U.S. Army, that for any space travel, seven symbols, to mark the coordinates, are necessary. Six of them indicate the destination, signing stars or constellations to locate the place to go. The seventh and last symbol, indicates the point of origin to start the travel. In the television series, an extra glyph was added, which indicates the destination galaxy.

DIRECTOR_CAMEO(Martin Wood): Wood had multiple cameos throughout the series, most of which were uncredited, non-speaking roles. Several of them involved him and Dan Shea (Siler) standing in the background holding a large over-sized adjustable wrench.

Don S. Davis had performed with Richard Dean Anderson on McGyver. He was a cement truck driver on "Blow Out" and as a poacher on "The Endangered".

In this show, Amanda Tapping played an Air Force scientist, who explored other worlds through the stargate. In Due South: Starman (1996), she played an Air Force scientist, who was apparently studying U.F.O.s on Earth.

Richard Dean Anderson and Christopher Judge appeared on MacGyver (1985) season five, episode thirteen, "Live and Learn".

Louis Gossett, Jr. and Stacy Keach were considered for the role of General Hank Landry.

Many actors and actresses in this show also made appearances in The X-Files (1993), often in recurring or guest roles.

The seasons four and five DVD sets use the Showtime opening credits.

Throughout the series, the character Daniel Jackson wears glasses. It is obvious that the glasses he wears are flat plate glass, which means he doesn't actually need to wear glasses in real life. Anyone who needs real glasses knows they are convex (curved) to accommodate the vision problem that is being corrected.

Over the course of the series, Carter died and came back nine times, O'Neill died and came back fourteen times, Daniel died and came back fifteen times, and Teal'c died and came back twenty-two times. These are known "deaths" that include alternate versions, virtual versions, and robotic versions of the characters. These are confirmed "deaths", in that the character had to be revived by some human or alien technology.

Christopher Judge (Teal'c) has only appeared without his character's trademark gold emblem in three episodes: season two, episode four, "The Gamekeeper"; season four, episode sixteen, "2010"; and season six, episode nineteen, "The Changeling." In fact, Teal'c is the only member of SG-1 who changed his appearances several times throughout the series run. During the first half of season four, Teal'c sported a blond-colored strip goatee. From season eight onward, Teal'c stopped shaving his head, and grows hair. Finally, for the series finale, "Unending", Teal'c acquired a gray strip of hair on his head, to symbolize his old age (which he will also wore in the SG1-related movies that followed, after the series end).

The SGC was run by five different people during the course of the show. Major General George Hammond was the commander in charge of the SGC for seasons one through seven, except in Stargate SG-1: Chain Reaction (2000), when he was briefly replaced by Major General Bauer. At the end of season seven, General Hammond was replaced by Dr. Elizabeth Weir, who went on to lead the Atlantis Expedition, and was replaced by Jack O'Neill after his promotion to Brigadier General. In seasons nine and ten, O'Neill was replaced by Major General Hank Landry, who commanded the SGC until the end of the series.

Six out of nine regular cast members (in at least one season) are American: Richard Dean Anderson, Don S. Davis, Beau Bridges, and Ben Browder, who played American characters, and Christopher Judge and Corin Nemec, who played aliens. Two cast members are Canadian: English-born Amanda Tapping and Michael Shanks, but both played American characters. Finally, Claudia Black is Australian, and she played an alien.