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Continuity mistake: During the final fight at the very end of the film, pay attention to Millie's bloody nose. At first, there's an equal amount on either side. But a few seconds later, the suddenly less blood on the left side of her face and more blood on the right side.

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Continuity mistake: This is a little difficult to explain, so I'll do my best. When Char makes Millie/Butcher open the jail cell, in the first shot (a side-shot) it's clear that Millie is about to grab the third bar in from the edge of the door. When it cuts to the front shot, she's suddenly grabbing the second bar in. Then when it cuts back to the side-shot, you can tell she just let go of the third bar in.

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Continuity mistake: When the Butcher nearly hits Josh with the stolen police car, Josh's hands go from being up in the air, to down by his sides instantly between cuts.

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Continuity mistake: When Josh's mom is about to cut the Butcher/Millie out of the chair, pay attention to her right hand, which is holding the knife. Right before the Butcher/Millie springs up, as she's talking to her son, her arm goes from down by her side with the knife pointed down, to up by her chest instantly between cuts.

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Continuity mistake: When Josh is watching over the tied-up Butcher, he's sitting on the couch, eating snacks and watching TV. If you look, you can see he has a cut on his face to the side of his mouth. When he gets up to get a snack, the cut suddenly vanishes and is missing for the rest of the scene. The actor must have cut their face right before they shot the couch bit, and then the rest of the scene was filmed either after it healed, or before it happened.

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Revealing mistake: When Millie (in the Butcher's body) knocks out the Butcher (in Millie's body) with the mini-golf club, you can see the Butcher react to being hit a split-second before he/she's actually hit. Slow motion helps, but is not required.

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Continuity mistake: When Char begins chasing the car with Millie, Nyla and Josh, they are on an empty road and there are no other cars around. Instantly between cuts, they are suddenly on a different road, in a different area, and there are a ton of cars around. Char started chasing them almost instantly, so there's not enough time for them to suddenly be on a different road in a different area.

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Revealing mistake: When Millie jumps on her shop teacher's back, the teacher switches from the actor to a stunt double as they begin to tumble about. Noticeably, his hair suddenly gets much darker and has less gray in it. You can also get brief glimpses of his face, and it's obviously not the actor.

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Continuity mistake: When the Butcher (in Millie's body) attacks her shop teacher, he throws her to the ground, and she drops the screwdriver literally right next to her head. It then disappears in the next few shots you see her. Then, when she gets up, it reappears in the wide shot, but is suddenly about three feet to the other side of where she dropped it. Sure, she's moving around a little... but she doesn't move around enough for it to suddenly be several feet on the other side of her.

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Continuity mistake: When Millie (in the Butcher's body) chases Nyla and Josh into the kitchen, Nyla turns around and Josh is not near her. But then in the next two shots, suddenly Josh is right next to her on her left. He then disappears from Nyla's side when she grabs the mop, and reappears behind her in the next shot. The scene is cut very frantically, so it can be hard to notice at first, but it's very obvious if you look for it.

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Continuity mistake: When the Butcher tackles Millie on the field, in the first shot he's on top of her, and she's flat on the ground. However, when it cuts to the side angle, the Butcher is already getting up and Millie has instantly turned onto her left side.

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Continuity mistake: When Millie is hiding beneath the bleachers and the Butcher is standing above her, pay attention. In the low-angle shots of the butcher, the air is clear. But in the shots that are parallel with him, there is some light precipitation visible in the air. (It looks like very light rain or snow.) It goes back and forth several times as it cuts between the two angles. It can be kinda hard to notice it at first, but once you see it, it's obvious.

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Continuity mistake: When Millie is outside the stadium, when she starts to sing "She'll Be Coming Round the Mountain," she goes from facing her left to facing forward instantly between cuts.

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Continuity mistake: When Millie and her friends are talking in the theater, when Josh says "The Blissfield Butcher," watch Millie. Her hands are both down, but when the camera cuts, they are instantly up by her face. Then a few shots later, they're back down again.

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Continuity mistake: Around the time Millie enters shop class, her teacher starts clapping, and he's facing forward towards the class. When it cuts to a closer shot, he's instantly turned partway and is looking at the student who just presented his project.

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Continuity mistake: When Millie wakes up at the beginning, in the first shot her comforter is up near her chest. In the next shot, it's instantly down by her knees. And in the next shot, it's instantly up by her waist.

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Continuity mistake: In the opening scene, pay attention to Evan's girlfriend's glass. When Isaac gets up and goes inside, the amount of liquid in her glass slightly changes between shots.

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Continuity mistake: When Zeke is messing with the drug dealer, he lays on his back and snaps a picture with the dealer's broken leg. When the camera cuts to a new angle, suddenly he's sat almost all the way up. (Presumably this was done to quicken the pacing of the scene, but it's still a mistake regardless).

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Continuity mistake: When Zeke and William are investigating the scene of Bozwik's death, pay attention when Zeke says that's not sure the body was a bum. The forensics agent behind William goes from walking to the side, to walking to the back, to standing still and taking a photo instantly between cuts. It's out of focus in the background, so it can be hard to notice... but it's there.

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Audio problem: When William reveals himself as the killer, he asks Zeke to be his partner. When Zeke says "I'm in," in a wide-shot, if you look closely, his mouth doesn't move, revealing the line was added in post.

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