When Oren's son gets into the car at the end of the movie, it is pouring with rain outside. Yet, when Russell enters the car not a drop of water is on him.
10 minutes into the movie, driving along in his car Oren's son slams on the brakes of his car to avoid a Black dog running across the road, when braking, the car is clearly on the center of the road, but in the next shot when he steps out of the car, the car is shown parked closer to the edge of the road.
Near the beginning of the film, Oren Little gets a paint-ball gun from the boot of his car and shoots at a dog but he canister that holds the paint-balls is missing from the gun.