Continuity mistake: During the parade, Flounder dumps the bucket of marbles towards the camera, and they are all clear glass marbles. When the ROTC members slip and fall on them, the marbles are red, blue and yellow. (01:38:25)
Continuity mistake: When Pinto and Flounder attend the Omega rush party, a tasteful piano piece is playing. Niedermayer catches the eye of the brother at the piano, who smiles back over the keyboard. Soon thereafter, Niedermayer points out two important Omega brothers, who are standing in conversation across the room: Terry Auerbach, captain of the swim team, and Carl Phillips, editor of the Daily Faberian. The music has not stopped, but, when Carl turns to the camera, we see that he's the same guy who's supposed to be playing the piano. (00:03:15 - 00:04:55)
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.
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.
Continuity mistake: As Niedermeyer chews out Flounder in the close ups, the long shots from Boon and Stratton's view of the action shows Niedermeyer mounted on his horse, then back to the close up of Niedermeyer dismounted, continuing to chew out Flounder.
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)
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)
Continuity mistake: In the parade sequence only a few smoke sticks are shown to be shot into the crowds, but when the DeathMobile emerges through the smoke you can see dozens of billowing smoke sticks aligned across the ground. (01:39:20)
Continuity mistake: When they're at the man's house who offers them some pot, you can see that he's petting a Siamese cat. But when he stands up to go put the blinds down, the cat is gone and he never moved it off his lap. (00:22:50)
Continuity mistake: When the authorities and moving crews are clearing all of the junk out of Delta House, we see a workman with a hammer removing the fraternity symbols from the house's upstairs railing. However, the symbols are not in the correct order: They read "Delta Chi Tau," and the workman is removing the "Tau" from the end. Moments later, we see the workman still removing the fraternity symbols, but now they are in the correct order, "Delta Tau Chi," and he is removing the "Tau" again, but removing it from the center.
Continuity mistake: When the Dean is on the phone in the middle of the night, his drunk wife gets her feet tangled in the phone cord, then falls off the bed, pulling the receiver off the hook. In the next shot showing her giggling on the floor, the phone cord is no longer visible.