When they are in the lab and go to the teacher to pick up their supplies, the boy drops the smaller beaker into the larger beaker twice.
When Lisa and Georgia are fighting in the makeup room, Lisa is wearing white shoes, then she is barefoot, then she wearing white shoes again.
When Georgia and Lisa are fighting in the dressing room, Effi watches and waits by the door. She is shown in several close-ups, but in the longer shots she is not there.
42 minutes into the film, the bedroom window keeps adjusting height depending on whether it's an internal, or external view.
When Dom locks herself in her room the door is locked with a slide lock attached to the door and frame, however Frank uses scissors to pick the lock that's beneath the doorknob.
Throughout the movie, any time a female screams it's always the same female voice no matter which character is screaming.