On the day of her audition, Lea Michele was in a car accident right outside of the studio. She came in literally still pulling glass from her hair.

In her audition for the role, Lea Michele sang "On My Own" from Les Miserables. However, the pianist cut the second verse without telling her. She stopped singing and told him "We have to go back and do the verse!" The writers laughed, and later said she definitely had the Rachel role down.

Several times during filming they had to stop rolling to tell Kevin McHale (Artie) to stop tapping his feet to the beat of the music.

Seventy songs were used in the first thirteen episodes.

Darren Criss got the part of Blaine after a nationwide open audition, in which anyone could upload a video onto Glee's Myspace page singing one of two songs they allowed. He originally auditioned for the role of Finn.

Cory Monteith didn't sing in his first audition video. He instead produced a beat using makeshift drums. The producers liked his personality and originality so much they called his agent and requested he fly to Los Angeles for a live audition.

The role of Quinn Fabray was not cast until the night before filming began.

Matthew Morrison is less than four years older than Cory Monteith, Mark Salling, and Harry Shum, Jr., yet he plays their thirty-something teacher.

The character of Kurt was written for Chris Colfer after he originally auditioned for the role of Artie. The writers told him that he looked like one of the Von Trapp kids, and Chris told them he actually just starred in The Sound of Music, playing Kurt Von Trapp. This obviously stuck in the writers' mind, as they called his character Kurt Hummel (the surname after the cherubic figurines).

Heather Morris (who had been a back-up dancer for Beyoncé' tour) was hired to play the character of Brittany after she was first called in by show choreographer Zachary Woodlee to teach the "Single Ladies" dance to the cast.

Kevin McHale (Artie Abrams) is the only actor to have appeared in every episode that comprised seasons one through four.

The only time Sue calls Emma by her correct name in the first two seasons is the pilot. All other times, she has "mistakenly" called her names like Irma, Alma, Ellen, Arlene, You, or the Redhead. Sue doesn't call her Emma again until the season three opener, "The Purple Piano Project."

Most of the cast were unknown faces, which is exactly what the producers wanted, and such was the level of spontaneity, auditions were often populated by youths who literally walked in off the street, eager for a crack at stardom.

Terri works at Sheets N' Things which is obviously a play on Linens N' Things. By the time the pilot aired, Linens N' Things had closed all of its stores across the country.

Until season four, each episode number six of every season of the show features a singing mash-up battle.

Gwyneth Paltrow was only booked for one episode in season two as Holly Holiday in "The Substitute." However, audiences and critics reacted positively to the character, and the cast and crew loved working with her so much, that she was asked to reprise her role in the season two episodes "Sexy" and "A Night of Neglect," and then back for the season five episodes "100" and "New Directions." She won an Emmy for her work on the show.

All cast members do their own singing and dancing.

Shortly after Cory Monteith died, Ryan Murphy revealed that the writers were forced to changed their original final image for the show, because this was Rachel (as a huge Broadway star) and Finn (as a McKinley professor) reunited after years apart. Rachel mentions this dream to Mr. Schuester.

Brian Stokes Mitchell, who plays one of Rachel Berry's fathers, was nominated for a 1998 Tony Award for Best Actor in a Musical for "Ragtime," in which Lea Michele (Rachel) also appeared (starting when she was only eleven years old).

Ryan Murphy wrote the part of Rachel Berry with Lea Michele in mind.

The restaurant the characters frequent is called BreadstiX. The series creator, Ryan Murphy, previously made a high-school themed show called "Popular," which featured the students congregating at a restaurant called Croutons.

Chris Colfer, Jane Lynch, Kevin McHale, Lea Michele, and Matthew Morrison are the only cast members to appear as series regulars in every season.

Harry Shum, Jr. is nearly a decade older than his character Mike Chang.

In 2010, Ryan Murphy announced that this show would be providing the funding for a job readiness counselor position at New York City's Hetrick-Martin Institute, an agency that provides support services and counseling to LGBTQ youth, and that also runs the Harvey Milk High School, a New York City public school for LGBTQ teens who have been bullied in their previous schools. The job had been eliminated because of budget cuts at the institute. Murphy also announced that the show will provide twenty-five thousand dollars in matching scholarship funds for Harvey Milk High School.

In season four, Sarah Jessica Parker didn't sign up for a specific number of episodes (like most guest stars do on television shows), but she and Ryan Murphy struck a deal, in which she would be asked if she was available a while before shooting an episode and they would manage dates.

The script mentions and references famous actors, actresses, and performers, and then later has them guest star playing made-up characters, rather than playing themselves. Examples: Neil Patrick Harris, Gwyneth Paltrow, John Stamos, Sarah Jessica Parker, Kate Hudson , Demi Lovato, and Ricky Martin.

Seasons one and two were written entirely by the three Creators of the show, Ryan Murphy, Brad Falchuk, and Ian Brennan. However, when "American Horror Story" was picked up, with Murphy and Falchuk as its show runners, this show had a writing staff for the remainder of its run.

Original audition songs: Matthew Morrison sang and played "Somewhere Over the Rainbow" on the ukulele. Lea Michele sang "On My Own" from "Les Miserables". Chris Colfer sang "Mr. Cellophane" from "Chicago". Jenna Ushkowitz sang "Waiting for Life to Begin" from "Once on this Island". Kevin McHale sang The Beatles. Amber Riley originally sang a pop song for her audition, but the producers asked her to sing "And I Am Telling You" from "Dreamgirls". Jayma Mays sang "Touch-a Touch-a Touch Me" from "The Rocky Horror Picture Show". Although many people believe Cory Monteith sang "Can't Fight This Feeling" for his audition, but he really sang "Honesty" by Billy Joel, which he revealed on the Canadian radio show Q. By the end of the first season, Morrison, Michele, Colfer, and Riley had performed their songs on the show. Mays sang hers in the second season.

Melissa Benoist and Grant Gustin went on to play two iconic DC superheroes Supergirl (2015) and The Flash (2014).

Heather Morris was originally brought in to teach Jenna Ushkowitz and Chris Colfer the "Single Ladies" dance (from season one, episode four), but was later hired to play the role of Brittany.

The role of Principal Figgins was originally written for a white actor. They ended up casting Iqbal Theba. An Indian character was written to be a part of the New Directions, but after Chris Colfer auditioned, they created "Kurt" instead.

Mr. Schue says that he was a freshman when April Rhodes was a senior in high school. In real-life, Kristen Chenoweth is ten years older than Matthew Morrison.

Much like her character Emma Pillsbury, Jayma Mays has a peanut butter and jelly sandwich every day.

Ryan Murphy created the role of Shannon Beiste specifically for Dot-Marie Jones, after their work together on the failed pilot Pretty/Handsome (2008).

Artie is named for Brad Falchuk's friend Arthur Stroyman, who was a jock who never understood the artsy kids in school.

Jessalyn Gilsig and Matthew Morrison play high school sweethearts, when Gilsig is seven years older.

Lord Tubbington's (Brittany's cat's) real name is Eragon. He also lives with another cat named Beezus. Both were featured on My Cat from Hell (2011), a television show for misbehaved cats.

Brittany was temporarily written out of the show, because Heather Morris was pregnant.

When "Glee" team - Ryan Murphy, Dianna Agron, Chris Colfer, Neil Patrick Harris, Jane Lynch, Kevin McHale, Lea Michele, Cory Monteith, Heather Morris, Matthew Morrison, Amber Riley, Naya Rivera, Mark Salling, Harry Shum, Jr., Dijon Talton, and Jenna Ushkowitz - all guested on The Oprah Winfrey Show (1984) (April 7, 2010), most claimed to be among the hardest working group of people in the television industry, starting at 6 a.m. and putting in as many as twelve to fourteen hours daily (Monday-Friday), and even rehearsing some weekends.

The Journey song "Don't Stop Believin'" is sung a total of six times throughout the course of the show. The episodes being, "Pilot", "Sectionals", "Journey to Regionals", "Sweet Dreams", "New Directions", and "2009".

The original idea of Glee was inspired by Ian Brennan's own experience as a member of Prospect High School's show choir. It was supposed to be a film, instead of a television series. Brennan wrote the first draft in August 2005, and completed it in the same year. The script, however, did not receive any interest from producers at that time. Michael Novick, a friend of Brennan's and a television producer, later gave Ryan Murphy a copy of Brennan's script, as they are members of the same gym. Murphy himself joined show choir when he was young, and thus related to the script. Murphy and Brad Falchuk suggested that Glee should be produced as a television show. Therefore, the three joined together and re-wrote the script. The re-written script was sent to FOX, and picked up immediately. The three decided to write all of the episodes by themselves. Murphy and Falchuk became Executive Producers and Directors of the show, while Brennan is a co-Executive Producer. Novick also became a Producer of this show.

Fans of the show refer to themselves as "Gleeks". The show embraced this and season two billboards and bus ads encouraged fans to "Gleek Out".

Lea Michele and Cory Monteith were dating in reality.

Even though she receives principal billing, Dianna Agron was the last person to be cast.

Much of the main cast of this show, performed for President Barack Obama, his family, and the approximately thirty thousand children and parents in attendance at the 2010 White House Easter Egg Roll on April 5, 2010. Among the songs the Glee group sang were "Don't Stop Believin'", "Over the Rainbow", and "Sweet Caroline", which songwriter Neil Diamond has said was originally written as a tribute to Caroline Kennedy, the daughter of President John F. Kennedy. Malia Obama and Sasha Obama, the daughters of President Obama, were in the front row to hear the concert.

Lea Michele appears in more episodes than any other cast member, with "Dynamic Duets", "The Role You Were Born To Play", and "Shooting Star", being the only ones where she's absent.

In early drafts of the pilot script, Quinn's name was "Liz Fabray".

The high school is named after William McKinley, Jr., who was the twenty-fifth President of the United States (serving between his inauguration on March 4, 1897, and his death by assassination on September 14, 1901. McKinley was one of eight U.S. Presidents to have come from Ohio, the state in which this show is set.

Iqbal Theba (Principal Figgins) does not like wearing make-up. The make-up crew lightly powders him with anti-shine right before the cameras roll.

Lea Michele (born 1986) is eight years older than her character, Rachel Berry (born 1994).

In real-life, Melissa Benoist (Marley) was married to Blake Jenner (Ryder). However, they have since filed for divorce.

Seasons two and three contain the most regulars, with fifteen, while the final season contained the lowest regulars, with nine.

Over the years, specially on the first couple of seasons, many actors, actresses, and singers were rumored to guest star on the show, like Justin Timberlake (as Will's brother), Jennifer Lopez, Javier Bardem (as a has-been rock star), Anne Hathaway (as Kurt's lesbian aunt), Julie Andrews (as Kurt's grandmother) or Bette Midler, who asked Ryan Murphy on Twitter, to be on the show. Bardem and Hathaway were reportedly approached for those characters, and it was Bardem who suggested his role.

Paris Barclay is the only person that directed episodes every season. He was nominated three times for an Emmy for his work on the show.

Cast members Matthew Morrison, Lea Michele, and Jenna Ushkowitz are all Broadway alumni. Morrison was the original Link in "Hairspray" and Fabrizio in "Light in the Piazza". Michele was the original Wendla in "Spring Awakening". Ushkowitz also appeared in "Spring Awakening" with Michele. Many guest stars have also been well known as Broadway stars: Kristin Chenoweth (April Rhodes) won a Tony for "You're a Good Man, Charlie Brown", and played the original Glinda in "Wicked". Idina Menzel (Shelby Corcoran) won a Tony as the original Elphaba in "Wicked" (in which she was Chenoweth's co-star) and was also in the original Broadway cast of "Rent" and "If/Then", and was the voice of Elsa in Frozen (2013) and Jonathan Groff (Jesse St. James) was the original Melchior in "Spring Awakening" (co-starring with Lea Michele and Jenna Ushkowitz), was the voice of Kristoff in Frozen (2013) and King George III in "Hamilton". Neil Patrick Harris (Bryan Ryan) was a replacement Emcee in the most recent Broadway revival of "Cabaret", and was the revival Broadway Lee Harvey Oswald and Balladeer in "Assassins", and won the Best Actor in a Musical 2013 for playing Hedwig in "Hedwig and the Angry Inch". Victor Garber (Will's father) played Anthony in the original Broadway cast of "Sweeney Todd", and many other Broadway roles, as well as Jesus in the movie version of Godspell (1973). Debra Monk (Will's mother) has performed in numerous Broadway musicals and plays, and also co-wrote the musical "Pump Boys and Dinettes". John Stamos (Dr. Carl Howell) had lead (replacement) roles in the 1990s and 2000s Broadway revivals of "How to Succeed...", "Cabaret", and "Nine". Carol Burnett (Sue's mother) was nominated for a Tony, for playing Princess Winnifred in the original Broadway cast of "Once Upon a Mattress". Brian Stokes Mitchell and Jeff Goldblum play Rachel's fathers. Goldblum started his career in Broadway musicals (including "Two Gentlemen of Verona"), while Mitchell is one of the pre-eminent Broadway leading men of his generation ("Ragtime", "Kiss Me, Kate", "Man of La Mancha", et cetera.)

While several "So You Think You Can Dance?" all-stars have appeared on the show as members of competing show choirs, only one was ever credited as appearing; Courtney Galiano.

Seasons two and three; and five and six, were green-lit together.

In the same year, Melissa Benoist (Whiplash (2014)) and Darren Criss (voiceover role on The Tale of the Princess Kaguya (2013)) were the first Glee cast members to be part of Academy Award-nominated films.

Melissa Benoist (Marley Rose) and Blake Jenner (Ryder Lynn) got married in 2015, but less than two years later, Melissa filed for divorce in December 2016.

This show premiered on May 19, 2009, and concluded on March 20, 2015.

Stephen Tobolowsky plays a character named Sandy Ryerson. Tobolowky appeared as pushy insurance salesman Ned Ryerson in Groundhog Day (1993).

Lea Michele auditioned with the song "On My Own". The same song was used for her character Rachel Berry's audition song in the first episode. Chris Colfer's audition song "Mr. Cellophane" was also used as an audition song in the first episode, for his character Kurt Hummel.

Lima, Ohio is a real place.

In this show, Blaine Anderson is younger than Kurt Hummel, because Kurt goes to New York City after graduating, while Blaine is still in high school. In reality, Chris is younger than Darren.

Grant Gustin and Melissa Benoist star in The Flash (2014) and Supergirl (2015) respectively, both portraying the main character. Blake Jenner also had a small part in Supergirl for two episodes.

Trisha Rae Stahl is only fifteen years older than Melissa Benoist, who plays her daughter.

Neil Patrick Harris and Jayma Mays also appeared in The Smurfs 2 (2013).

Naya Rivera and Amber Riley both auditioned for American Idol (2002). Adam Lambert and Jessica Sanchez both competed in that show.

New Directions was originally supposed to win regionals at the end of the first season, as Series Creator Ryan Murphy didn't think the show was going to be picked up for a second season. When he became aware a second season was going to be made, he changed the outcome of the season one finale, to make their drive to win in the second season more passionate.

In the third season of the show, it is revealed that Finn's father died from a drug overdose. Cory Monteith, who played Finn on the show, died of a combined drug intoxication a little over a year later.