Continuity mistake: A group of people are in the copying room taking turns taking pictures of their butts on the copier. When one of them sits on the glass part of the copier, the glass part breaks. When he gets up, it's not broken.
Continuity mistake: When Willie first goes to his mom's apartment, when she is talking to him, her bra strap is on her shoulder from the front but from the back it's off her shoulder. It keeps changing position in every shot.
Continuity mistake: As the guy is being strangled and going up the tree his hat changes positions. (01:12:30 - 01:30:00)