According to director Mel Gibson, Desmond T. Doss's son Desmond Jr. attended the screening and was moved to tears by Andrew Garfield's accurate portrayal of his dad.

Mel Gibson said that the battle scenes were influenced by nightmares he had during his childhood, when his father Hutton Gibson, a WW2 veteran who served in Guadalcanal in the Pacific theatre, described the horrors he witnessed as bedtime stories.

Hal B. Wallis had previously tried to buy this story from Desmond T. Doss in the 1950s, and hoped that Audie Murphy would star. Doss didn't want his story turned into a typical Hollywood movie.

The trailer states that Desmond T. Doss was the only soldier to serve in a front-line capacity without carrying a weapon. In WWII, Korea and Vietnam, the military gave several Seventh-Day Adventists the status 1A-O--willing to serve but not to carry a weapon in combat. A number of Quakers volunteered for service in WWI.

A number of events were changed or left out of the movie: Desmond almost shooting his father after a fight with his mother. In real life the fight was between Desmond's father and his uncle, and his mother stepped in to take away the gun, getting Desmond to hide it. Desmond also had an older sister, Audrey, who was not portrayed in the film. Desmond didn't meet Dorothy while she was a nurse at a hospital. In fact, she didn't become a nurse until after the war. They met when she came to his church selling Adventist books. He also didn't miss their wedding by being put in a holding cell, as they were already married by that point. Desmond's prior combat at the Battle of Guam and the Battle of Leyte is skipped over, making it seem as if the Battle of Okinawa was his first combat experience. The assault on Hacksaw Ridge seems to only last a few days, although Desmond's Medal of Honor citation covers events over about 3 weeks, and the Battle of Okinawa itself lasted 82 days.

Shot in 59 days.

The film had a 14-year path from idea to production, according to an article in "Variety".

The battlefield sequence, overseen by Mel Gibson's longtime stunt double Mic Rodgers, was filmed on a small dairy farm (about 100 square meters) near Sydney, Australia. Smoke trucks circled the perimeter to make sure any scenery that didn't look like WWII Okinawa was effectively blocked out.

In 2004 Terry Benedict directed The Conscientious Objector (2004), a documentary on the life of Desmond T. Doss. The film was produced mostly before Doss died, and it reveals many small details that were changed for the Hollywood release. In the documentary Doss reveals that his nonviolence was inspired by a drunken fight between his father and his uncle in which a gun was involved. If his mother hadn't gotten between them, taken the gun, given it to Desmond and told him to hide it, his father may have killed his own brother-in-law. Desmond said that was the defining moment in which he swore to never carry a gun.

The battle scenes took 19 days to shoot.

With the exception of Vince Vaughn (Sgt Howell), the rest of the major actors as well as the supporting cast in the movie were born or raised in either England or Australia. This is because the film had a relatively low budget and the production needed a majority-Australian cast to qualify for Australian government subsidies as a supplement.

When the Doss family is eating supper and Desmond's brother enters wearing an army uniform, Desmond only has vegetables on his plate. Later, in the foxhole, Desmond refuses canned meat, saying he doesn't eat meat. In real life, Desmond T. Doss was a vegetarian, like many Seventh Day Adventists.

The film received a standing ovation lasting nine minutes and 48 seconds at the Venice Film Festival in September 2016. Mel Gibson timed it himself.

Harry S. Truman, the US president at that time, gave Desmond T. Doss his Medal of Honor.

When Dorothy gives Desmond Doss the Bible before leaving for basic training, it is bookmarked at 1 Samuel 17. This is the Old Testament account of David and Goliath.

Film debut of Milo Gibson. NOTE: He is the son of Mel Gibson, and this is the first cinematic collaboration between the two.

Teresa Palmer wanted a role in the film so badly that she auditioned via her iPhone and sent the recording to Mel Gibson. She heard nothing back for three months, until Gibson called Palmer to tell her in a Skype chat that she landed the role of Dorothy, Doss' wife.

One aspect that appealed to Mel Gibson in making this movie was that it contained a "real" superhero without spandex.

The first film directed by Mel Gibson in a decade, since Apocalypto (2006).

Several shots of Japanese soldiers charging come from Oba: The Last Samurai (2011).

James Horner was originally hired to compose the score. He had previously collaborated with Mel Gibson on The Man Without a Face (1993), Braveheart (1995), and Apocalypto (2006). After Horner's sudden death, John Debney (composer for The Passion of the Christ (2004)) was chosen as the film's composer. His completed score was rejected, and Rupert Gregson-Williams replaced him for the final cut.

The Biblical passage narrated by Desmond Doss at the beginning of the film is from the Book of Isaiah, Chapter 40.

Mel Gibson stated that if Desmond T. Doss were alive today, he would want him to be President of the United States.

Desmond T. Doss was not the first conscientious objector to receive the Medal of Honor. Sgt. Alvin C. York was also a conscientious objector. Gary Cooper portrayed him in Sergeant York (1941). According to Wikipedia, York denied that he had been a conscientious objector. York carried a weapon; Doss did not.

Desmond Doss lived a long and happy life with Dorothy and their son Tommy on a small farm in northwestern Georgia, despite his injuries and the lingering effect of the tuberculosis he contracted during the war. Desmond and Dorothy were together just shy of 50 years, until her death in 1991. He married Frances Duman in 1993, and remained with her until his death in 2006 at the age of 87.

WILHELM SCREAM: Is heard at 1:22:08; during the assault on the bunker.

In order to make the battle scenes look more realistic, Mel Gibson purchased two $1500 hand-held cameras with his own money.

Stan Jensen from the Seventh-Day Adventist Church took this story to screenwriter/producer Gregory Crosby in the late 1990s.

Mel Gibson was originally meant to play Sgt Howell but passed on the role to Vince Vaughn in order stay focused on directing the film.

Mel Gibson stated that Desmond T. Doss was the first conscientious objector in American history to be awarded the Medal of Honor, and he has inspired others to save almost the same number of lives and those inspired have gone on to become recipients of the Medal of Honor.

Teresa Palmer worked on this movie in Melbourne while finalizing her work on Berlin Syndrome (2017) in the same city.

While only listed as "Japanese General" in the credits, the seppuku (ritual suicide) scene shows the death of Gen. Ushijima Mitsuru, commanding officer of the 32nd Army, which bore the brunt of the fighting on Okinawa. The details as shown were relayed by his chief of staff, Col. Yahara Hiromichi.

Screenwriter-producer Gregory Crosby originally brought this project to the table.

Vince Vaughn's involvement was his first visit to Australia since Dodgeball: A True Underdog Story (2004). During filming he explored Sydney and its attractions and made headlines when he participated in a public climb of the Sydney Harbour Bridge.

The weapon Sgt. Howell (Vince Vaughn) is using is an M3, .45-cal. ACP submachine gun, known as the "Grease Gun" or "Greaser." It received its name because it resembles the common garage tool. It came into use late in the war, supplanting the venerable Thompson submachine gun (aka the "Tommy Gun"). It was not a general-issue weapon to infantrymen; normally it was meant to be the crew weapon on a tank due to its compactness, firepower, and maneuverability in confined spaces like in a tank, or for officers, both non-commissioned and commissioned, and special units. Many, however, did find their way to regular front-line troops in mid-1944. Initially, the M3 was not popular; it had some mechanical faults and did not look like a reliable weapon to the soldiers using them, especially when compared to the more elegant Thompson, but the M3 eventually won their respect with its advantages and effectiveness in action. The feed system consisted of a 30-round detachable box magazine. This earlier-model weapon had a cocking lever on the side that you can see during some scenes in the movie if you look closely. Later models (M3A1) were charged by simply pulling back on the bolt by inserting your finger into a recess in the bolt, with the M3's handle eliminated due to complaints of it breaking under rigorous use. The M3A1 wire stock included a tab to help load magazines, the ends were threaded to accept a cleaning brush to clean the barrel as well as being used as a wrench to unscrew the barrel for disassembly. The M3A1 went on to serve the U.S. Army from the end of World War II up to its own replacement by the M4 carbine in the 1990s, commonly accompanying tank crewmen. Some examples may have served for longer in the U.S. military, and other nations continue to use them actively. The weapon was manufactured by, among others, General Motors Headlight Division and cost about $20 apiece, as opposed to the Thompson, which cost about $100 apiece, even after being simplified. In 2016 the unit cost to manufacture the M3 was approximately $208.00.

One of the philosophies the Japanese soldiers had on Hacksaw Ridge was to target and eliminate medics and B.A.R. (Browning Automatic Rifle) men. Their objective in doing so was to lower American soldiers' morale and which would make them easier to defeat. However, the Americans found out about this and took countermeasures: medics removed their armbands and helmets with the Red Crosses on them so they could not be easily identified and targeted. B.A.R. men took extra precautions as well, and contributed greatly to the Japanese defeat on Hacksaw Ridge.

Randall Wallace was previously set to direct.

In an interview, Desmond Doss stated that he did not feel like a hero: "The real heroes are still buried over there."

Luke Bracey's character states multiple times how hot he thinks Teresa Palmer's character is. This is notable, since she played his love interest in Point Break (2015).

The only Best Picture Oscar nominee that year not to be nominated in any of the writing categories.

Experts at GoldDerby.com had widely predicted the film to be the Academy Award front runner for Best Sound Editing. Arrival (2016) won instead, while this film won two Oscars that La La Land (2016) had been predicted to win.

Vince Vaughn says the line, "Well, Dorothy, looks like we're not in Kansas anymore", a reference to The Wizard of Oz (1939) to Jon Favreau's failed chat-up line in Swingers (1996), in which Vaughn also stars.

Aaron Schneider was previously set to direct.

Released on Goran D. Kleut's (Ghoul) 41st birthday.

Luke Bracey and Teresa Palmer co-starred in Point Break (2015).

Hugo Weaving plays Johann Schmidt (Red Skull) in Captain America: The First Avenger (2011) and Thomas Doss (Desmond's father) in this film, both of which are set during WWII.

The war movie 'The Lighthorsemen' (1987) set during World War One features a pacifist character who does not kill. In the later Australian feature film, 'Hacksaw Ridge' (2016), it featured a central character who was also a pacifist character, with his pacifism in World War Two being the major theme in the picture. 'Hacksaw Ridge' (2016) was made and first released almost thirty years after 'The Lighthorsemen' (1987) (twenty-nine to be exact) and was directed by Mel Gibson who had starred in the classic Australian feature film about World War One, 'Gallipoli' (1981), which was directed by Peter Weir. Both 'Gallipoli' (1981) and 'The Lighthorsemen' (1987) shared two major filming locations of Port Lincoln and the Flinders Ranges which are both located in South Australia. Both 'Gallipoli' (1981) and 'Hacksaw Ridge' (2016) won several AFI / AACTA Australian film awards, including Best Film, with 'The Lighthorsemen' (1987) winning a couple of AFI awards, the same number as 'Hacksaw Ridge' (2016) won Oscars.

Pfc. Desmond T. Doss was not wounded and evacuated in a daylight assault at Hacksaw Ridge. He was wounded a couple of weeks later in the Okinawa campaign during a night attack near Shuri. As per his Medal of Honor citation, he was wounded in the legs by a grenade but had to wait five hours before stretcher bearers could reach him, during which time he dressed his own wounds. While being carried back to safety by three stretcher bearers, they were attacked by a Japanese tank. Doss crawled off the stretcher to a more seriously wounded man and insisted the others evacuate that soldier and then return for him. While waiting for the stretcher to return, he was shot by a sniper as he was being carried by another soldier. This caused a compound fracture of his arm, for which he improvised a splint using a rifle stock. He then crawled 300 yards to an aid station for treatment.

Mel Gibson stated there were aspects of this event that were true but that he couldn't include in the film because he felt people wouldn't believe they were true: Doss stepped on a grenade to save his buddies and was hit by shrapnel, but as he was being carried away by medics he saw another soldier injured. Since Doss himself was a medic he jumped off his stretcher and treated that soldier and told the medics to take care of other wounded soldiers; he then crawled back to safety while being shot at by enemy snipers. While lowering men down the ridge, a Japanese soldier had Doss in his sights several times, and every time he did, his gun jammed, preventing him from shooting him. This was also for fear that no one would believe it. In reality, Doss' bible went missing as he dragged himself to safety. Months after he was shipped home, he found it in the mail; his entire company, which once mocked him for his convictions, searched all over Hacksaw until they found it.

When asked how many lives he saved, Desmond T. Doss said approximately 50. However, witnesses said it was closer to 100. A mutual agreement was reached at approximately 75.

While at the end of the movie it says Desmond saved 75 men by directly lowering them from the escarpment, he also treated around 55 more that were able to retreat without assistance after treatment during the battle. Over the course of his tour, which lasted approximately three weeks, he rescued nearly 300 men.

Desmond T. Doss was a member of the US Army's 77th Infantry Division. Known as the "Liberty Division" for its distinctive insignia of a gold Statue of Liberty on a blue isosceles-trapezoid background, the 77th fought at Guam, Leyte (Philippines) and Okinawa. One of its units, Company C of the 306th Infantry Regiment, left the US in 1944 with 203 officers and men. By war's end in August 1945, just 13 of the original members were left. The 77th fought alongside the Marines, and a newspaper article during the war described how the division's soldiers fought so well at Guam that they earned the ultimate compliment--the Leathernecks nicknamed their Army counterparts the "77th Marine Division." Famed war correspondent Ernie Pyle was killed by an enemy sniper while covering the 77th on Ie Shima, a small island off the west coast of Okinawa. The 77th was part of the Allied force that occupied Japan after hostilities ceased, and was deactivated on March 15, 1946. However, the lineage of the 77th Infantry Division has since been 'inherited' and continued by the 77th Sustainment Brigade, a unit of the US Army Reserve raised in 1963, and which remains in service and uses the same insignia as the 77th Infantry Division.