Continuity mistake: John is taken down by a trap set by Hansel and puts a big hole in his back. He gets back up and is shot down by the Sheriff. As he is getting up a second time, it shows his back. There is no hole in his back or shirt before the Sheriff finishes him off. It also shows no hole or blood on his back in one shot when he is chasing with the bear trap before he is shot the first time. (01:16:45)
Revealing mistake: The father's fiancée is killed by a machete to the neck. She is quite obviously dead. But when Gretel picks up her cross necklace, you can see her eyes closed, but fluttering. (01:19:10)
Continuity mistake: As Lilith is calling Gretel stupid meat, she is holding a bowl and is standing in front of her and Hansel. The side shots show Lilith's hand and bowl barely visible in the left side of the fame. Close ups on Lilith show she does not move any closer. But in the later side shots, she is suddenly much closer, having her torso and hands visible in the side shots. (01:20:35)
Continuity mistake: After calling Gretel stupid meat, H&G are sitting on her couch. Hansel is wounded and leaning back, his head back. In the same shot, he then leans forward so he is slumped over and hangs his head. It then cuts to a further shot and suddenly he is leaning back again. (01:21:05)
Revealing mistake: H&G trap Lilith in the oven and turn it up, Lilith catches on fire. You can see her skin and face begin burning and melt off. Her clothes combust. But her hair is perfectly fine up till the point when she explodes. Yet hair is very flammable. (01:24:00)
Plot hole: The room that the teens are kept in while being fattened up is locked up by a single, wooden, thin door with a conventional doorknob as the only lock. That door is way too flimsy to hold them. Two strong teenage boys with two girls there as well could have easily broken the door down with little effort and escaped.
