PCU (1994) - 4 mistakes

Plot hole: When the Daves steal the liquor bar, the jock/bartender is looking right in their direction, yet doesn't notice this huge bar on skateboards. Granted, he's an idiot - but he wasn't blind.

Continuity: When David Spade first takes a flyer for the pit party, he folds it half length wise and width wise, forming a quartersheet before placing it in his coat. When he later removes the flyer from his coat, it's been folded twice lengthwise, forming a long skinny strip instead of a quartersheet.

Other: When the president of the school comes to the Pit to tell them they're being evicted, Gutter is grilling steak in the living room, yet the smoke from the flames magically disappears and the room is smoke free.

Revealing: During the Bicentennial celebration, two guys from the pit are supposed to be distracting the security guards by faking seizures. During the close-ups we can see that the security guards are all huddled around the guys wondering what's going on, and basically not on their guard. However, whenever we see a shot of the stage, the security guards can be seen in the background standing naturally and guarding the steps of the stage. This does not coincide with the shots of them huddled around the guys who are having the seizures.