Continuity mistake: When the guys and girls are running through the airport, Taylor (Ashley) tips her pop can completely sideways, which proves she wasn't really drinking.
Continuity mistake: In the scene where they are getting their driver's photos, they switch between a front view and a back view of the girls. When they show the back of Mary-Kate, she is shown wearing a jean jacket. But she is actually wearing a white shirt. Ashley is the one wearing the jean jacket. They show the same back angle shot for each girl. (00:05:10)