Continuity mistake: Kate at the beginning of the movie asks Demerius, the kid who is reading a manga, to read some of it loudly for the whole class. When she addresses him first, the book on his desk changes position between shots, repeatedly. (00:01:20)
Continuity mistake: Back home after being soft-fired, Kate takes the bottle of beer Meg offers her and joins her in the dance. Soon it becomes obvious that there's nothing to party for, for either of them. When Meg says "I don't even want to talk about it" after mentioning the car being towed, Kate takes a sip holding the bottle by the neck. In the following one, she is holding the bottle by the belly. (00:06:30)
Continuity mistake: In front of the elevator at the Sheraton, a stoned Kate touches Meg's lips; she uses just her index finger, but as the doors go "ding" she suddenly has 4 fingers raised in the reverse shot. (00:19:50)