Continuity mistake: When Carter first starts to confront the drunk patients Angel and Nathan, the door to their room is open behind him. Angel falls to the floor and the shot shows the door is now closed. The shot goes back to Angel laughing and the door is ajar again. Then it's closed again, and then open when Susan comes into the room. All this happens within a few seconds.
Continuity mistake: When Doug is outside with his father, and the shot is on Ray, we can see a lot of snow in the air, but when the camera goes to Doug, there is no snow at all. The snow distribution on his father's coat change from shot to shot as well, too much to happen in only a split second.