As was listed in another goof, there were some inconsistencies with the scores during the Greek Games portion of the Homecoming Carnival. Part of this is because one of the events, a Chariot Race, was cut from the final version of the movie (the Chariot Race can be seen on the "panty raid edition" DVD under Deleted Scenes.)
The label for the brown bottle of "Liquid Heat" changes position between shots to always face the camera.
The roof-mounted packing trunk disappears momentarily during the initial drive to Adams in Mr Skolnick's car.
When Coach Harris lectures the jocks following losing at the homecoming carnival, behind him is a blue wall with text reading "Only the strong shall survive" and a door that reads "COACH HARRIS." But when the Alpha Betas run out of the locker room, the blue wall has become white and there is no writing on it.
During the fraternity house party, the blond, curly-haired nerd with the black fedora dances behind Louis and his date, while simultaneously standing behind Poindexter in the kitchen.
In the end credits for the musical listings, Elektra Records is misspelled as Elecktra.
Gilbert's intent to calculate an "exact ETA" makes no sense, as ETA means "estimated time of arrival." The best he could produce would be a close or "reasonable" estimate.
Mopery is not exposing oneself to a blind person, that would be public nudity. Mopery is any minor or petty crime.
The trichloromethylene Takashi takes to counteract the alcohol does not exist. A common misconception is that they are talking about chloroform, which is also known as trichloromethane. Ingesting chloroform would have very different effects.
When the Alpha Beta house burns down, the dean is called out. This seems unusual, since most fraternity or sorority houses are privately owned instead of being university owned, and they are often located off campus.
[12:09]As the fire department extinguishes the frat house fire, they spray water on the "AB" sign above the door. The distinct blue glow of a gas burner is visible.
Many of the videos the Nerds receive of the Pis using the cameras are from angles that were not attainable with any of the ceiling-mounted cameras.
Betty gives Stan his football pin, back. In the end scenes, she's wearing it again.
[38:31]At the approximate time mark: 38:31 they are showing the surveillance camera to spy on the Pi sorority. If you notice that the camera is plugged in but that the camera also has no RG36 cable wire hooked up to it and it would be impossible for the camera to transmit anything whatsoever at this date and time which is 1984.
During the end of Carnival show, Poindexter's fingers aren't moving on his electric violin.
While the nerds are eating breakfast in their new house, the calendar is on September, yet when they were renovating the house the previous day, the trees in the neighborhood were almost totally bare with a few orange leaves present, which would suggest it was at least November.
When Judy is serving food at the party, a piece of chicken is seen falling off the plate.
In an early scene, while at their frat house, Ogre is holding a person upside down by his ankles from the second floor and then simply drops the guy. That fall would most likely have killed him.
In most frames of the Homecoming Carnival skit performed by the Pis, they clearly aren't singing, yet multiple voices are heard singing throughout the song. At one point in, the girls grunt at the same time they are singing.
When the horn players begin to play, officially commencing the Triathalon, the trumpet player on the right does not lip synch on cue. Towards the end, he is taking breaths when instead, he should be blowing into the instrument.
While Gilbert and Louis are carrying the trunk towards their dorms, just before the two bikes crash into each other, the shadow of the camera and cameraman appear on the road.
After the Alpha Beta house burns down, the Alphas invade and forcibly evict the freshmen's dorm. to make it their new frat house. In reality, they would not have been able to do this without repercussions, especially since the freshmen were already paying room and board. Similarly, this action would not have been tolerated by the school's administration.
Given their abuse of power on the Greek Council, it would be odd for the Alpha Betas and Pi's to not enact any punishment whatsoever on the nerds following their "panty raid" when they would have actually had a legitimate reason to do so.
In the computer lab, when Judy and Gilbert first meet (visible in the distant "behind the computer" shot at the beginning of the scene). Possibly only visible in open matte fullscreen versions of the movie.
When Lamar starts climbing the rope into the Pi house during the panty raid scene, he kicks Wormser in the face as he stars climbing the rope.
During the Lambda/Omega Mu song, when Lamar is singing, Poindexter can be seen "bumping" to the music (going up on their toes) out of time with the others. Possibly deliberate since he is shown to be uncoordinated throughout the film.