Deliberate mistake: In the towel-dance scene after Demi has put on her white panties and spins off the towel from her hair she starts to rip off her body towel. Then in the next frame the towel is again tucked in. Apparently they didn't want Demi topless when she leaned over to slip on her blue shorts.
Continuity mistake: In the scene where the inspector is questioning Erin you see two men walking by. When they are out of the picture the inspector asks a new question. When the shot cuts back to Erin you see the two men walking by her. They should actually be several feet behind her by this time.