Continuity mistake: When Neidermeyer is yelling at Flounder about his pledge pin, Neidermeyer is spitting the P's in Flounder's face. When this happens, the camera is on Neidermeyer and if you look at Flounder, (even though it's his backside), you can see his eyes close everytime he's spitted on. However, afterwards, the camera changes to Flounder instantly, and his eyes are wide open (as if they never closed at all). Nobody's eyes instantly open THAT quickly after being spat on.
Audio problem: When D-Day, Bluto and Flounder are running out of Wormer's office after the horse died, there is a sound effect of them screaming as they flee the scene. This exact same sound effect is used when the boys run out of the all-black bar, except Bluto and D-Day weren't there; it was Flounder, Kroger and Boon. (00:30:40 - 01:17:15)
Continuity mistake: When the Deltas are leaving the student court on masse, you can see Bluto followed by Flounder exiting the hall as Vernon shouts "I'm calling your national office." After several more seconds of Vernon shouting and Greg frantically slamming his gavel, it cuts to a shot of the doorway with Bluto and Flounder just walking up to it and stopping to grin at Vernon. They would've been long out of the room by then.
Audio problem: At the bar after the tall black man asks to dance with the boys' dates, he lifts the booth table up off the floor. There's a sound like it's being forcibly ripped out of the floor, yet the table has a round bottom with no visible bolts or screws. While it may have been heavy, it wasn't secured to the floor.
Revealing mistake: In the scene where Babs is writing down what is said during the Fraternity's disciplinary hearing, (Court reporting) no ink is actually coming out of her pen as she writes on her notepad. That is, the notepad remains blank even as she turns to a new page while writing. (01:04:50 - 01:05:55)
Continuity mistake: When Pinto and Flounder visit the Omega house in the opening of the movie, notice the girls coming down the stairs. In the first shot they are there, the second shot they are not, then they are. (00:03:00)
Continuity mistake: After Stork pushes the drum major off camera to the right and seizes his baton, the scene cuts to a longer shot where he leads the band in the same direction. The drum major has disappeared. (01:36:30)
Revealing mistake: During the scene where the Delta boys are looking at slides of the recruits from the evening, Otter steps in front of the screen to defend Flounder. Notice that he is standing directly in line with the projector to the screen and there is no shadow on the screen nor is part of the slide projected onto his chest. (00:14:10)
Factual error: Mrs. Wormer confuses the meanings of "sensual" and "sensuous". Sensuous merely means appealing to the senses; sensual has sexual connotations. In other words, vegetables are sensuous; people are sensual. (00:46:45)
Continuity mistake: When the Deathmobile lines up across the street to take out the grandstand, the car reaches the grandstand about three times before it actually rams it. Even after one shot if the car reaching the grandstand, it cuts to D-Day yelling "Ramming Speed!" and then the car is seen back at its original position on the other side of the street.
Continuity mistake: The candle on the table appears/disappears when they're at the bar where Otis is playing, especially when the big dude removes the table to "dance with their dates". (01:16:40)