Continuity mistake: When the main character goes to check the place where the dead bodies lie, after having seen the red light flash, the rope above the supposedly dead body is still swinging. If you keep watching it you can see that it keeps moving with the same frequency.
Factual error: When we see the detective pour the sample of Martin's sperm onto Joyce's body, the liquid is thick and bright white, like PVA glue; however the detective acquired the sample several hours earlier, and ejaculate loses that appearance/consistency almost immediately (30 minutes at most), becoming thinner and almost transparent.Purple_Girl
Continuity mistake: The prostitute at the beginning of the film, who is attacked while on a table playing dead for her client, grabs the ceiling fan cord and pulls repeatedly to try and pull herself away from him. The fan, which is directly above her, comes loose and falls, yet when it crashes to the floor, it lands away from the far end of the table, when it should have landed almost directly on top of her.Purple_Girl