Goofs

When Amy makes her move, before she say checkmate, you can see the whole board. And her move did not put Frank in checkmate, only in check, (his knight could clearly hinder her attack).

Stacey has a gag in her mouth, yet she is distinctly able to yell "Help!"

When Amy tries to call her ex-boyfriend, she hears a standard ringing tone and a message that tells her that the person she is calling is unavailable, both from the earpiece. This is supposed to be because she cannot get a signal on her mobile phone. In actual fact, if her phone didn't have a signal, she wouldn't even hear that. At best, her phone might give a few beeps.