Continuity mistake: When it shows Mandy reading from her book, she has nothing visible sticking up from it in the wide angle. When it cuts to a close up suddenly the dollar bill she's using as a bookmark appears. It's first on the right side, then switches to the left side and further down. (00:17:30)
Factual error: This movie takes place in 1983, but the Dollar Bill Mandy is using as a bookmark is from 2009. (00:17:40)
Revealing mistake: When Brother Swan goes to blow on the "horn" (which is actually an ocarina), he toots out a few different notes. However his fingers stay completely stationary on the instrument and not moving around on the holes to change the notes. So it would have been just one sound but it plays like 3. (00:29:25)
Factual error: Spoiler! The cultists burned Mandy alive by wrapping a sleeping bag around her, putting gas on her and hanging her from a metal swing set and setting her on fire. After Red frees himself later and craws up to her remains, it's shown that she is barely a pile of ash with her skull still somewhat in shape when he picks it up. It then crumbles into just ash showing she had been fully burnt to the very center. This would not have been the case with how they burned her. Their was nowhere near enough heat or kindling to keep her body burning long enough to turn completely to ash with no remains like that. She would have died, yes, but would have mostly stayed intact as a single body burnt very bad. Bones, features, charred organs would still have been left behind. (01:04:00)
Revealing mistake: When Red hits one of the demon bikers with his vehicle after he shoots it with an arrow, as the vehicle flips from the impact that there is actually nothing there he hit. (01:16:20)
