- Co-writer Chris Miller based the National Lampoon short stories that gave rise to the film on his experiences in the Alpha Delta Phi fraternity at Dartmouth (from which he graduated in 1962).
- The movie was set to be filmed at the University of Missouri until the president of the school read the script and refused permission. It was filmed at and around the University of Oregon in Eugene instead.
- The President of the University of Oregon only allowed this movie to be filmed on that campus because he decided he did not know how to read screenplays. In 1967 he had received the screenplay for a movie but had denied it permission to film there. That movie was The Graduate (1967) and he liked that movie so much that he decided he didn't want to miss another opportunity, so he allowed Animal House (1978) to be filmed on the University of Oregon campus. But he insisted that the college's name not be listed in the film's credits.
- The movie concludes by describing each character's fate. Niedermeyer was "killed in Vietnam by his own troops." In director John Landis' segment of Twilight Zone: The Movie (1983), some soldiers are overheard discussing "fragging Niedermeyer."
- The bass player in the band Otis Day and the Knights is then-unknown bluesman Robert Cray. Cray was instrumental in getting the musicians together that appeared as the band.
- Babs becomes a tour guide at Universal Studios. The credits for this and other John Landis films contain an advertisement for a tour at Universal Studios. The ad says, "Ask for Babs." As of 1989, Universal Studios no longer honors the "Ask for Babs" promotion, which was either a discount or a free entry.
- Before Donald Sutherland was brought on board, John Belushi was the highest-paid actor in the cast at $40,000.
- On Delta's fraternity banner, the motto "Ars gratia artis" can be seen. This also appears in the studio logo of MGM.
- Virtually unheard of, "Toga Parties" became all the rage in colleges all over America after the release of this film.
- Donald Sutherland was so convinced of the movie's lack of potential, that, when offered a percent of the gross or a flat fee of $75,000 for his three days' work, he took the upfront payment. Had he taken the gross percentage he would have been worth an additional $3-4 million.
- John Belushi's wife, Judy Jacklin (now Judith Belushi-Pisano), is an uncredited extra in several toga party scenes.
- The original house on the University of Oregon campus used for exterior shots of the Delta house is no longer standing.
- The interior scenes of the Delta house were filmed in a Sigma Nu fraternity. The exterior of the Delta house was a dilapidated house from the 1800's that was torn down in the early 90's. The sorority house's exterior is the real exterior of the Sigma Nu house that was used for the interior scenes.
- John Landis had a budget of only $2.5 million, so to cut costs the movie was shot almost entirely on the U of O campus, including the court scene and scenes in the dean's office (the exceptions being the road trip and the parade, which were filmed near Cottage Grove, Oregon).
- Chevy Chase, Bill Murray, Brian Doyle-Murray, and Dan Aykroyd all turned down roles in the film due to prior commitments.
- The University of Oregon reluctantly allowed its campus to be used and gave the crew 30 days to complete filming. This meant that the cast and crew faced six-day work weeks and completed shooting with only two days to spare.
- Although the film takes place in Pennsylvania, a Tennessee flag is shown in the courtroom. This is because the set decorator was unable to find a large enough Pennsylvania flag for the scene, and the blue Oregon state flag wouldn't work because it had "State of Oregon" text on the upper part. So the set decorator used the most generic flag he could find, which turned out to be the Tennessee state flag.
- Director John Landis has stated that his original choices for the roles of Boon and Otter were Bill Murray and Chevy Chase. Neither could be signed on for the movie because of scheduling conflicts.
- Film debut of Kevin Bacon.
- John Belushi was flying between Eugene, Oregon and New York City twice a week in order to finish the movie, and rehearse/film for "Saturday Night Live" (1975).
- The role of D-Day was written for Dan Aykroyd and based on his motor loving personality.
- Principal photography was completed in 28 days.
- John Belushi wanted his character to go with the others on the road trip but director John Landis refused, arguing that his character was best used sparingly.
- One bit that was written in the original script but never filmed included a parade bust that was destroyed at the climax of film. The bust was of John F. Kennedy, the US President in 1962, and the gag was Kennedy's head was punctured in the same way the real Kennedy would be shot the next year. Landis cut the idea because he felt the tone of the gag was wrong.
- To celebrate the 25th anniversary of the release of this film, a parade was held down Hollywood Blvd. featuring not only cast and crew members, but recreations of parade floats used in the movie.
- The Faber College football team is called the Mongols. Faber Mongols are a brand of pencil.
- The full name of the Delta House changes during the movie. When the movers are taking out the contents of the frat house the name is Delta Tau Chi. Earlier in the movie it is Delta Chi Tau.
- The noble brass theme heard when the Faber campus is first shown is an excerpt from Johannes Brahms' "Academic Festival Overture". This melody is based on a German student drinking song called "We have built a stately house".
- In the Student Court scene, a list of Delta Tau Chi members is written on the blackboard. Writer Chris Miller's name is one of those visible on the list. Other names include "Dick Hertz" and "Duane Wayne".
- The list of names on the blackboard includes their graduation year (e.g., "Gregg Marmalard '63"). John Blutarsky's is listed "'60, '61, '62, '63".
- Chevy Chase was originally asked to play the role of Eric Stratton. The role went to Tim Matheson instead, who later starred with Chase in Fletch (1985).
- The original script called for Flounder (Stephen Furst) to be admitted to the fraternity only if he told one of Larry Kroger's (Tom Hulce) secrets. Flounder blurted out, "He's got spots on his weenie!" Later, during the naming of the pledges, when Larry asks why his Delta name is Pinto, the entire fraternity drunkenly yells, "'Cause you got a spotted dong!"
- The front of the Deathmobile has the statue's head of Emil Faber (the school's founder) mounted as a hood ornament.
- In the original script, Flounder and Sissy fell asleep during the toga party; another sign that Flounder wasn't cool.
- Verna Bloom mentioned that her scene with Dean Wormer where she is drunk and he is on the phone with the mayor, was completely improvised as John Landis was not happy with the lines the scene had.
- Meat Loaf was the second choice for Bluto in case John Belushi dropped out of his role.
- To get the role of Neidermeyer, Mark Metcalf lied about his ability to ride horses. After he got the role, he immediately took equestrian classes.
- The toga party band's real name is Carl Holmes and The Commanders.
- John Landis sacrificed his heavy beard and much of his hair to appear in the film as a cafeteria dishwasher who catches Bluto mooching and tries, unsuccessfully, to stop him. The scene was filmed, but despite his personal sacrifices, Landis eventually also sacrificed the scene.
- The original script called for a scene of competitive projectile vomiting ("booting") in the Delta House basement. Flounder was going to fail at this repeatedly. Later, after throwing up on Dean Wormer when he's told he's flunked out, Boon congratulates Flounder on his technique.
- Stacy Grooman, Flounder's girlfriend Sissy, was actually a student at the University of Oregon at the time the movie was filmed.
- Named the #1 comedy on Bravo's "Funniest 100 Comedies."
- The movie's line "Toga! Toga!" was voted as the #82 movie quote by the American Film Institute (out of 100).
- Premiere voted this movie as one of "The 50 Greatest Comedies Of All Time" in 2006.
- Niedermeyer's line "You're all worthless and weak, now drop and give me twenty!" was used in the Twisted Sister song "We're Not Gonna Take It" (Mark Metcalf appears in the video). Furthermore, the music video for Twisted Sister's “I Wanna Rock” features a high school student, clearly based on Flounder, being ridiculed by a teacher (Mark Metcalf again). At the video's conclusion, the principal (played by Stephen Furst) sprays Metcalf in the face with seltzer water.
- The characters of Stork and Hardbar were created to give Doug Kenney and Chris Miller a reason to be on set, and had come from different portions of a deleted character named Mountain. Hardbar was named after a real frat brother of Miller's who masturbated excessively.
- Karen Allen's first movie.
- More money was spent on advertising and promotion for the film than the film itself.
- The Delta House actors were brought to the set five days before the Omega House actors to get into character, in an intentional effort to cause cliques to form. Barry Levinson would use this tactic years later with the principal cast of Diner (1982).
- The hole John Belushi makes in the wall with the guitar is the only physical damage to the house the movie-makers made during the entire shoot. Instead of repairing it, the fraternity placed a frame around the hole with an engraved brass tag around the hole commemorating it.
- Jack Webb and Kim Novak were the original choices to play the roles of Dean and Mrs. Wormer
- 'Harold Ramis (I)', who co-wrote the film, based some of the pranks on his college experiences at Washington University in St. Louis, specifically when Otter and Boone are hitting golf balls at the ROTC.
- Spawned a short-lived ABC television series, "Delta House" (1979); also "Brothers and Sisters" (1979) on NBC and "Co-ed Fever" (1979) on CBS, which was canceled after only one episode.
- The tune that Otter whistles throughout the movie is the main theme ("Peter's Theme") from Sergei Prokofiev's "Peter and the Wolf".
- The dead coed is named Fawn Leibowitz. Fawn was a character used in ‘National Lampoon's 1964 High School Yearbook’.
- Professor Jennings bites an apple while lecturing about good and evil in John Milton's "Paradise Lost". This is a deliberate gag reference to Eve's eating fruit from the Tree of Knowledge, a key event in "Paradise Lost" (and referenced too perhaps by the statue pedestal motto seen in the opening titles: "Knowledge is Good"). Jennings' students miss the gag - as seems most Animal House (1978) viewers.
- During interviews conducted for the 30th anniversary of this film, Karen Allen revealed some interesting trivia about her nude scene. Director John Landis wanted her to bare her bottom in the film and she was very reluctant to do so. Donald Sutherland stepped in and offered to bare his as well. Allen said "I thought he was so sweet to do that, so I sort of let go of my objections and said, 'Okay, if Donald Sutherland is going to bare his bottom, by golly, I'll bare mine too!'"
- Harold Ramis wrote the part of Boon for himself to play, but John Landis felt Ramis was too old. Ramis was so disappointed he refused to accept a smaller part Landis offered him. (Ramis was 32, Peter Riegert was 29.)
- Mark Metcalf originally auditioned for the part of Otter.
- Producer Matty Simmons, founder of the National Lampoon, contributed one line to the script: Bluto's "Seven years of college down the drain!"
- A scene featuring Otter driving a girl (played by location scout Katherine Wilson) to the Rainbow Motel on Old Mill Road is seen briefly in the original trailer but was deleted from the film.
- To prepare for their roles, the actors playing the Deltas went to a real frat party at the University of Oregon's SAE house (except Belushi who was working on "SNL" that night). The real fraternity members did not like the actors being there and a brawl ensued. When John Belushi returned to the set and heard about the fight, he had to be physically restrained from seeking revenge.
- The actors who played the Deltas harassed the actors who played the Omegas off-screen as well to keep up the feelings of animosity between their characters. Mark Metcalf changed his hotel room to the one above Bruce McGill's where the Delta actors partied every night so his anger at their noise would help him get into character.
- Chris Miller based the character of Pinto on himself. Dean Wormer was based on Richard Nixon and Miller's Dean at Dartmouth.
- After the first day's shooting of the homecoming parade, there was a heavy rain that night. The next day, the production crew rented a field-burning tractor that shot flames across the width of the street to dry it.
- All of John Belushi's behavior in the cafeteria was improvised. He was not told to pile all the food on his tray and when he did the director urged the camera operator to "stay with him." The infamous "zit scene" was also improvised. The reaction from the cast is genuine.
- Originally, Harold Ramis and Doug Kenney's idea was titled "Laser Orgy Girls", a comedy about Charles Manson as a high school student. Producer Matty Simmons suggested that the setting be changed to college and the content to be toned down. Ramis also incorporated ideas from an earlier treatment he wrote titled "Freshman Year" based on his experiences in college.
- Ivan Reitman wanted to direct but the studio wanted a more experienced director. Richard Lester and Bob Rafelson were approached before Landis was hired.
- The scene in which Bluto smashes a bottle over his head to cheer Flounder up took 18 takes because Furst kept laughing.
- The Delta actors partied together every night but John Landis kept John Belushi away from them by having him stay in a house miles away with his wife, Judy. Belushi was a notorious partier and Landis wanted him to stay clean throughout the shoot. Belushi did host a few parties at the house but stayed clean because he saw the film as a great opportunity for him.
- According to actor James Widdoes ("Hoover"), none of the seven principal Delta actors (John Belushi, Tim Matheson, Peter Riegert, Tom Hulce, Stephen Furst, Bruce McGill, or Widdoes himself) had ever belonged to a college fraternity.
- In the final climax of interrupting the parade, this whole sequence was brought to the Universal back lot. At the time this section of the back lot had been used several times over. However, the section of road the parade ends up at is the same section that Robert Zemeckis used for the clock tower sequence in _Back To The Future (1985)_. Every angle of this street is used, but never once do you see the front of the clock tower set. The only time you do see the tower is from the back end.
- Neidermeyer's horse, Trooper, was portrayed by Junior, who subsequently appeared in The Black Stallion (1979) as the horse Napoleon.
- The scene where John Belushi is teaching everyone the "dirty lyrics" of the Kingsmen's Louie Louie is based on an actual investigation conducted by the FBI from 1963 to 1965 were they spent over two and a half years trying to decode the otherwise distorted lyrics in search of profanity.
- The female clerk whom Flounder (Stephen Furst) buys the marbles from is actually his wife.
- The core group of Deltas (D-Day, Otter, Boone, Hoover, Flounder, Bluto and Pinto) actually traveled up to the filming site a week early, by director John Landis' request. He wanted the group to emotionally bond so that their friendship would look genuine in the film.
- During their bonding week before filming, the seven Deltas partied a lot in their hotel. Bruce McGill actually stole the piano from the hotel's lobby and moved it into his room so that the group would have music.
- During filming, John Belushi would often go to several local nightclubs to check out the various bands. Belushi was fascinated by a musician named Curtis Salgado. Salgado's sunglasses, harp playing and love of the Blues inspired Belushi to form The Blues Brothers with fellow _"Saturday Night Live"_ (1975) cast mate Dan Aykroyd.
>>> WARNING: Here Be Spoilers <<<
Trivia items below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- SPOILER: Many first-run theatrical releases showed a glimpse of Clorette topless during Pinto's makeout scene right after she drunkenly blurted her age ("I'm only thirteen") and passed out, leaving Pinto holding the tissue with which she'd stuffed her bra. By the time home video became widespread, some American obscenity laws forbade showing minors nude in sexual situations - actual or "depicted". The latter was meant for illicit composite images, but could be construed to mean acting also. The actress was 18 at the time of filming, but when her character announced her age as thirteen, a legally-problematic situation arose. Her bare chest is absent from nearly all home-use copies of the film.
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