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)
Factual error: In the scene where Larry and the Mayor's daughter are on the football field, it appears to be artificial turf. Artificial turf wasn't invented until 1965, 3 years after the movie was to have taken place. (01:32:00)
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.
Continuity mistake: When the "Deathmobile" first appears, it spins around 180° and is parked parallel to the curb in front of the Beauty Bar (just past the grandstand) when Bluto pops out dressed as a pirate. When seen next it's now at a 45° angle facing the grandstand in front of the Fashion Store, but it was never heard or seen moving between shots. (01:39:55)
Continuity mistake: At the end of the parade, Neidermeyer has a rifle in his hand as Flounder approaches him with a seltzer bottle calling his name. Neidermeyer lifts the flap of his pocket to reveal one round for his weapon. He loads it in to the chamber and fires. He then reaches in to his pocket a second time, loads and fires, but the first shot showed only one round in the pocket.
Continuity mistake: While the chaos during the parade scene near the end of the movie is happening, look at the store windows during some of the shots of the people running up and down the streets. Some of the light up signs and other posted items on the windows, appear to be reversed as if the same shots were used several times, just reversed time from time to make it appear that people were running in both directions of the street.
Factual error: At the end of the movie when the riot is taking place, Niedermeyer takes out a bullet and fires upon Flounder from maybe ten feet away and misses - all the bullet does is shatter the seltzer bottle and nothing else. Whether Niedermeyer meant to miss Flounder or not, the bullet would have shattered the bottle with little or no deformation to the bullet itself and would have hit the pedestrian running behind Flounder.
Continuity mistake: At the start of the party, the character collecting the coats throws them on the floor in front of the door. Yet when Kent Dorfman and his date enters the house, they are obviously not there, as the door opens easily and they do not have to step over them when they enter.
Factual error: In the scene with the disciplinary meeting, the chalkboard says "Pan-Hellenic Disciplinary Council." National Pan-Hellenic Council is the governing body for sororities, not fraternities. Fraternity disciplinary hearings would be handled by either the Inter-Fraternity Council (IFC), or the school's Office of Student Conduct, in conjunction with the Director of Greek Affairs. Further to this error is that the rest of the chalkboard writing pertains to the meeting being held at that time, and Greg Marmalard calls the meeting of the "Disciplinary Council" to order. (01:01:25)
Other mistake: When Pinto throws rocks at the mayor's daughter's window, the first two rocks bounce off the window and don't get her attention. The third rock supposedly breaks the window. If you watch closely, you'll see the rock bounce off the window while a glass breaking sound is heard. Likewise, when the mayor's daughter opens the window, it is intact.