Continuity mistake: When King is fighting with Lazarus in the bar, Lazarus gets blood near his mouth like you get when getting hit in the face. But when they fight near the white door, the blood is gone. (01:13:00 - 01:18:00)
Continuity mistake: After having sex on their 2nd date, Lawrence and Janet are talking in bed. Her arms move instantly from over her head to her side.
Continuity mistake: When Will's mum takes her shoes off she is not wearing stockings. Will starts giving her a foot rub with nothing on her feet. When he goes to get the computer left by the neighbour his mum has stockings on. (00:15:20)
Continuity mistake: In the scene at the end of the film at his grandfather's empty lake house, Simon first unloaded the wooden Christmas figures from his duffel bag onto a pile of firewood on the dock. He then went into his grandfather's workshop and sawed the scroll off of his mother's violin. With his phone, he took a picture of the severed scroll in his hand with the dock in the background, but the dock was empty.
Continuity mistake: When Abby is finished washing the dishes, she tosses the towel she was using and it lands on top of a red can. An immediate close-up of the towel on top of the can proves this (0:25:29). A second later, the picture zooms out again to show her bending over from exhaustion (0:25:30). The towel is no longer on the can, but behind it against the wall. Abby follows the shop owner into a room adjacent to the kitchen and when they come back, the towel is once again on top of the can (0:25:55), but most of it is inside the can this time. It's obvious that neither her nor the shop owner has touched the towel and no one else is in the shop. (00:25:25)
Continuity mistake: The neighbors are dripping wet as they get out of the hot tub, yet they don't drip any water when they get onto the trampoline.
Continuity mistake: 50 Cent goes through the window onto the floor below. There is glass and debris everywhere. Our heroes run past him later and there is no sign of the window debris.
Continuity mistake: When Michelle and Leonard are up on the rooftop for the last time, the left side of her hair keeps swapping from being behind to in front all the time.