Other mistake: Based on its position (facing the overhang), the "OPEN" sign inside the restaurant ("NEPO") would NOT be visible to anyone outside of the restaurant, thereby defeating its purpose. (00:36:35)
Suggested correction: It absolutely would be visible. What are you even talking about? The sign seems to be at roughly 5' or so off the ground based on its position in the window. The overhang seems to be at least 6' in front of the sign, AND at least a few feet above it. How is someone's view of the sign going to be obstructed by something above it? Anybody walking by would be able to see the sign! I've seen diners that have signs in pretty much exactly the same sort-of spot.
Factual error: The force with which Paul thrust the knife into John's stomach, plus the amount of time that the knife was digging into John's stomach as Paul suspended him against the wall, would cause a severe, incapacitating injury - or death. John should have been rendered incapable of even crawling along the floor, but he managed to get up soon thereafter and chase/ fight with Paul in the woods. Miraculously, John also did not seek or undergo any treatment for the stab wound. (01:14:14)
Suggested correction: Whether he should have died is entirely dependent on if he hit any major arteries or organs. Being stabbed in the gut is not an instant death sentence. Additionally, he's running on adrenaline and shock... there have been numerous times someone has been shot or stabbed and been able to run away or fight back in real life. Also, he literally fainted before he could seek out medical treatment, so I'm not sure what your comment about "miraculously" not seeking medical treatment is about. That's 100% conjecture on your part. And conjecture based on no evidence is not a mistake. Obviously he was given medical treatment after he passed out.
Other mistake: When PJ opens the door for the officers, the painting on the wall behind him is not straight as would be expected - it is how it would appear if looking down a hallway (the top and bottom of the frame are not parallel). (00:33:56)
Suggested correction: There's absolutely nothing wrong with the painting. It isn't parallel because the wall behind him is at an angle from the position of the camera. If the wall was parallel with the camera, then this "mistake" might be right... but it isn't. The wall is at about a 45 degree angle facing away from the position of the camera. (Although to be fair, even if the painting was crooked, I don't see how that would be a "mistake.").
Character mistake: John shot at the "werewolf" but wasn't successful in hitting it. Instead of pursuing the werewolf, who he supposedly was determined to catch, he let it run away. Alcoholic or not, a sheriff's deputy should have done everything possible to try to capture the creature that was terrorizing the small town. By not even attempting to follow the werewolf, John missed the one opportunity he - or anyone else - had thus far to potentially put an end to the senseless and tragic murders of young ladies. (00:55:35)
Suggested correction: Dude's daughter was attacked and bleeding from the head, of course he didn't pursue it.
Suggested correction: He didn't go after the wolf because his daughter was hurt, and his (albeit misguided) parental instincts took over. It's not at all a character mistake for him to prioritize making sure his daughter is all right over chasing a perp. Most parents would probably do the same thing.