Continuity mistake: The cop shoots his six shooters nine times when he's in the attic.
Continuity mistake: In the scene where Claire and Dillon are racing away from the scarecrow in the police car and they are stopped by two policemen in the middle of the road, Claire is driving and Dillon is handcuffed in the backseat of the police car. The policemen tell them to get out of the car and they do so without any help. The back of a police car does not have any handles, Dillon couldn't possibly have opened his door unless this wasn't a real police car.
Continuity mistake: In the very first scene a crow lands on the scarecrow, then falls over dead for no reason - the scarecrow hasn't been possessed yet.