Revealing mistake: In the parade scene, not only are people wearing long hair and bellbottoms, but late '70s vehicles can be seen passing or parked in the background. Also in one shot, behind the marching ROTC, a camera rig can be seen in front of spectators photographing the parade.
Revealing mistake: After the Deathmobile ramming, when all the grandstand participants are in the heap of broken two by fours, you can see several chainsaw gashes in the structure made by the crew in order to pre-weaken the grandstand and facilitate its collapse.
Factual error: The bottle of Jack Daniels that Bluto chugs has an aluminum twist-off cap - a convenience not yet available in 1962.
Factual error: The Coca-Cola sign on the pop dispenser in the cafeteria has the "Dynamic Ribbon" device as part of the Coca-Cola trademark. The movie is set in 1962. Coca-Cola didn't start using the Dynamic Ribbon on its trademark until 1970.
Revealing mistake: When the people from the grandstand are flying up in the air after the Deathmobile hits it, you can tell they used a trampoline to get the effect as the woman are in their stocking feet; it would have been a safety issue if they jumped in high heels.
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.
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.
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.
Audio problem: When Bluto is using the ladder to look in the sorority house, the ladder gives a clanging sound like an aluminum extension ladder. The ladder Bluto is using is a single frame wooden ladder which wouldn't make any clanging sounds at all.
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.
Revealing mistake: When Bluto first watches the sorority girls on his ladder, he moves to the left screen. As he is moving the ladder, the curtain in front moves too. The glass pane is not present, likely to prevent reflection of the camera.
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: 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.
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.
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.
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.
