Revealing mistake: 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.
Continuity mistake: 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.