Continuity mistake: Cereza takes a bath. She does not have glasses in the bath tub. Thrice during this two minute period, the film shows her glasses to be in the hotel room, on her bed, along with her dress. And yet, when Cereza comes back to the room, she has glasses on. (00:38:00 - 00:40:00)
Other mistake: When the title card "FLYING MONKEYS" appears on screen, during the opening fly-over shot, if you look near the bottom right of the screen you can see something briefly move into, then out of, shot. (00:02:28)
Continuity mistake: When the awful cousin Charlotte hands Gwen the slice of unbirthday cake, she does it with her right hand, left hand, right hand. (00:04:20)