Corrected entry: In the scene when the girls are in the kitchen and Kate gets four Diet Cokes out and Kate's Mom comes in, her mom says a couple lines, grabs one of the Diet Cokes and walks off, she then tips it back and drinks it, however, she never opened it and she tips it back all the way as if drinking the last drop in the can. This is completely impossible in the time provided.
Corrected entry: After the scene where they all fall off the cheerleader pyramid, where John is talking to Heather about Kate, notice the guy at the locker just to the left of Kate when she's by the wall. The guy closes his locker and walks off just as Heather finishes with John, but in the next shot, he's still at the locker. (00:34:20)