After Judd is hit in the head by the rifle, the wound repeatedly swaps between the right temple to the left temple.
In the movie's opening scene. As one of the angels approaches her victim (from behind shot) she can be scene wearing shoes even though she is supposed to be barefoot.
When they are in the forest talking about making a fire, they mention they have plenty of petrol, when in fact, their Volkswagen Transporter is diesel.