Continuity: Nancy throws a snowball and it hits the windshield of Jacob's truck. It leaves a distinct blotch of snow where it hit, but in the reverse shot, the windshield is clean.

Continuity: The house that the main characters live in is shown very early in the movie. We see the people looking out of a large window in an upstairs bedroom, which faces the front driveway. But that window doesn't even exist when they show the outside of the house.

Revealing: After Hank shoots Lou's wife in the kitchen, the camera shows Jacob walking into the house, then Lou's body on the floor with a puddle of blood around his head. If you watch closely, you can see Lou's left eye twitch.