Goofs

The letters on the balcony change from "DXT" to "DTX" and back again while the house is being gutted by the authorities.

When Bluto is sneaking up on the sorority sisters' house, the exterior shot of the upper floor windows shows the women's actions in silhouette, as if there were a blind or curtains completely obscuring the window. But once Bluto climbs the ladder, each view of Bluto shot from the inside the house shows him through an unobstructed window. Then when the shot switches to a view from the outside, the windows are again obscured.

When Shelly is surprised by the guys running out of the club, she is topless. When she dives into another car window moments later, she's wearing a bra.

At the parade mayhem, Bluto slides down from the rooftop to the street, tearing up the "Welcome Alumni" banner in the process. In a later scene, the banner is whole again.

When Otter is talking to Mrs. Wormer in the grocery store, the price signs change.

At the ROTC inspection, Neidermeyer salutes Chip Diller and Diller returns the salute. Since Chip Diller is the lower ranking officer, he should have saluted Neidermeyer, and Neidermeyer should have returned the salute.

The ROTC cadets are conducting physical training in full dress uniform. That is prohibited by regulation. Physical training is only conducted in athletic wear or combat dress uniform.

As someone previously mentioned that the 'Camelot' float was done more than a year before the word was ever mentioned regarding the late President Kennedy, the same can be said about the sorority girls all wearing imitation pink suits with the pill box hats. Mrs. Kennedy wore that suit when the President was assassinated in November 1963 and the movie was in 1962.

Army (including ROTC) drill teams are issued non-firing, usually obsolete, rifles for public demonstrations. (In part for safety and in part because of the risk of damage to the weapon.) The rifles used in the parade should not have had firing pins and, therefore, Neidermeyer should not have been able to fire live rounds with them.

The M1917 Neidermeyer shoots at Flounder fires a powerful .30-06 round that should have passed on through the Seltzer bottle and then struck either Flounder or one of the bystanders running in the background.

When Bluto falls from the sorority house, you can see the false ground move when he impacts.

During the riot toward the end when Flounder sneaks up on Neidermeyer to spray him with the bottle of seltzer, Neidermeyer shoots the bottle out of Flounder's hand. There are people running behind Flounder at the time, directly in the path of the bullet, but no one is wounded.

When the band is marching down the alley at the end of the film, the "brick wall" that they all run into repeatedly bounces back and forth as it is touched.

The text of the "Daily Faberian" newspaper with the headline "Delta Probation Hearing" is random paragraphs repeated over and over.

When pirate Bluto swings from the roof using a banner, his stunt harness cable is visible.

When the psych midterm exam is being mimeographed, although it says "PSYCHOLOGY 101" at the top, it appears to be a history exam (topics included on the paper include "Greece from the age of Pericles to the fall of the Athenian Empire" and "crisis and social conflict in Rome from the Gracchi to Sulla").

When Bluto is guzzling the bottle of "Jack Daniels", during final few gulps, carbonation foam is visible in the bottle with the last few gulps suggesting it is, of course, not Whisky but a soda beverage.

In addition to the previously mentioned error involving the Mayor's Oldsmobiles, although Mayor DePasto owns an Oldsmobile dealership, the car seen in his driveway when Larry brings his daughter home in the shopping cart after the toga party is a Buick. The mayor also promised free Oldsmobiles for the parade but the decorated car that Bluto tosses Mandy into is also a Buick.

When Eric and Mrs. Wormer are alone together in a room, Mrs. Wormer kicks off her shoes which travel towards a glass coffee table and a shattering sound is immediately followed. However, it can clearly be seen that the coffee table's glass top hasn't shattered.

When John Belushi is on the ladder peeping on the sorority sisters then starts "jumping" the ladder to the next window, he would have had to pass a bay window on the ground floor which would have been impossible to do without getting off the ladder.

When Katy is walking through the kitchen with her bare behind showing, she passes a refrigerator with a US Bicentennial sticker on the door. The Bicentennial was in 1976, of course, fourteen years later.

When going to the bar to see Otis Day, many of the African American patrons in the bar are wearing 1970's hairstyles/clothing with Afros/sideburns/polyester which wasn't in style in 1962.

In the homecoming parade there is a float showing President Kennedy and the word "Camelot". The use of this word dates from an interview Jackie Kennedy gave Theodore H. White days after Kennedy's assassination in which she revealed that the President listened to the music from the Broadway musical "Camelot" before he went to sleep. The movie occurs before his death and uses a word not associated with the president at that time.

The car that Flounder borrowed from his brother is a 1964 Lincoln Sedan whose body style was not introduced in 1962.

A major song that is featured in the movie is 'Louie, Louie'. The movie is supposed to take place in the Fall 1962 - Spring 1963 timeframe, however, 'Louie, Louie' (by the Kingsmen) was not released until late 1963 (November-December timeframe).

Durng the Toga party, when Otter (Tim Matheson) takes Mrs. Wormer (Vera Bloom) to his room to seduce her, she kicks off her shoes, one after another. The first one lands on the floor, and the other one bounces off the edge of the glass coffee table, then onto the floor, and the sound of shattering glass is heard, yet the table remains intact.

While Neidermeyer's horse is rearing its hind legs after Otter hit the horse with a golf ball, we hear Neidermeyer shout to the cadets "Get back in ranks! Attention!", but he is not speaking.

As Bluto makes his way down the cafeteria line, the feet of a crew member following him are visible in the angled mirror above the food.

Blutarsky (Belushi), dressed in pirates garb, climbs up the side of the building before he grabs the banner and rides it across the street. He is chased to the building by ROTC cadets. You can see a civilian give Belushi a two handed lift up in order to help him up the building. The ROTC cadets act as a screen to minimize our being able to see the boost.

When Bluto falls with the ladder, you can clearly see the fabricated ground give way when he lands.

At the very beginning of the shot where Boon's golf ball smashes through Dean Wormer's window, a hand gripping a slingshot-like device is visible firing the ball.

After the Deathmobile crashes into the grandstand and the people go flying into the air, there is a shot showing the wooden structure from behind, teetering. You can see a chain or rope at the top partially hidden by the bunting pulling the structure down to the ground.

In the trial scene, one of the flags is the Tennessee state flag. The movie is supposed to be set in the Northeast (notice Otter's reference to being at Amherst when they go to Emily Dickinson college).

The movie is supposed to take place in Pennsylvania, however during the night time scene in the football stadium with Pinto and Clorette, PAC 10 school banners can be seen hanging on the wall in the background (since the movie was actually filmed at the University of Oregon).

During the parade scene, when a police car skids to a stop on a side street, in the background you can clearly see a sign on a building, "Cottage Grove Sentinel". That's the name of the newspaper in Cottage Grove, Oregon, where the scene was filmed.

It does not make any sense to expel a freshman who hasn't even completed a whole quarter or semester for academic reasons. Technically, they don't even have a GPA yet, despite what the Dean says. (This was likely intentional on behalf of the filmmakers to show how rigid and ridiculous the Dean was.)

When Niedermyer is yelling at Flounder, the boom mic is reflected in his helmet.

During D-Day's throat percussion at the top of the stairs

As the ROTC cadets are marching down the street in the parade at the end of the movie, the left front cadet fails to spin his rifle with the others, and simply keeps marching.

As already mentioned, despite the Mayor's promise of the use of "his free Oldsmobiles," all of the convertibles shown in the parade are 1960-62 Buicks and one Cadillac. The only Oldsmobile in the entire film is the yellow 1963 Dynamic 88 shown in the dealership being hit by the out of control "hand float."

When the Omegas are shown waiting for Otter in the Rainbow Motel Chip Diller (Kevin Bacon) is wearing a Faber letterman's sweater with two rings on the sleeve, which would indicate he was a Junior. It is clearly established that in 1962 he is still a Freshman which should have no rings on the sleeve, assuming he could have even earned a letter during his first semester.

The American flags in Delta/Animal House are all 48-star, World War II-era flags. By 1962, when the film is set, America had 50 states. Therefore, the flags should all have 50 stars (although this could be deliberate to show that the members of Delta House are too lazy to get updated flags.)

Marion Wormer (Dean Wormer's wife) tells Otter, "I'm old enough to be your mother...almost". Verna Bloom isn't even almost old enough to be his mother, she is only eight years older than Tim Matheson.