Character mistake: The police claim the Myers house is at "45 Lampkin Lane." The address on the front porch clearly displays the number 709.
Character mistake: Since the Book of Revelation ends with Satan being defeated, Damien and his followers should be aware of this. That's why it makes no sense that they keep quoting from Revelation since it ends up spelling their demise (it does not predict that the Anti-Christ will destroy the earth as they keep claiming).
Character mistake: Ginny is supposed to be put head first into the ambulance, not feet first. All the monitoring equipment is in the front of the head. (01:24:20)