Continuity mistake: When Alex is feeding David in the hospital, his scar changes between shots.
Continuity mistake: The first werewolf never damaged Jack's face, but when he is dead he has large scratches on the face.
Continuity mistake: David's body changes angle and moves between shots when he is dead.
Continuity mistake: After the wolf kills Jack the amount of blood on his face changes between shots.
Continuity mistake: At the beginning sequence, after he leaves the car with the sheep, David has dirt on his jacket. In the next scene, only a few seconds later, the dirt has gone.
Answer: Traumatic events have a tendency to disrupt the memory - people who have been involved in a car accident, for example, often have no memory of the events leading up to the accident, even though they would obviously have perceived those events at the time. The physical and mental stresses of the werewolf transformation have clearly disrupted David's memories in a similar fashion.
Tailkinker ★