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)
Continuity mistake: When Santa tells Noelle he's anxious about inheriting his dad's role, the position of his arms is inconsistent between front and side shots.