Continuity mistake: In the scene where Chyna decides she needs to fall down the stairs to break the chair she's chained to she's supposed to be handcuffed. As she starts to fall and tumbles down her hands are not handcuffed and fling around wildly.
Continuity mistake: Using a red marker, Chyna writes "KILLER" on a scrap of paper and slips it out the window of the RV. Later, when the paper is found by the policeman, the handwriting has changed.