Continuity mistake: After Marnie/Antonia sees the damage she has caused with her spell and is spotted by the vampires, in the next shot she is standing in front of Roy. In the shot immediately after, she is standing at least a foot to the left of Roy.
Continuity mistake: When Lafayette is possessed by Mavis and shoots at the police, Jason and Andy run out of the house. In the wide-shot, Jason throws himself on the ground, and rolls around on Andy's right. In the following close-up, Jason lands on the ground again, this time on Andy's left.