Continuity mistake: In the intro, the woman shimmies off her shirt, which pools on the bathroom floor. She finds the obligatory corpse, screams, and gone is the shirt from the floor. (00:02:00)
Continuity mistake: Towards the end when the police arrive, there is an error. When you first view the officer, he is dead and leaning back in his car seat. The next part, he is slumped over his steering wheel. Then he is once again leaning back in his seat.