Continuity mistake: The two friends are talking at the beginning of the movie. Claire says "To be fair, I am drunk half the time" just as she pops a snack in her mouth. New shot and Claire is holding a cigarette in the same hand she just used to feed herself, laughing at that joke in a huge puff of smoke. (00:04:20)
Continuity mistake: At the wedding of her friend, Zoe drinks from her glass, looking 3/4 empty. Cut, and the glass is more than half full. (00:07:10)