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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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Continuity mistake: When the cop tells Tree to drop the ax, she lets go of it and puts her hands up. However, her hands raise and lower instantly between cuts several times depending on the angle. On the angle facing her front, her hands are up by her head. But in the angle behind her, they are down by her shoulders.

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Continuity mistake: In the beginning, when Bozwik is chasing the purse-snatcher, pay attention. Right before he says "Police! Freeze!," he's running by several people on his right... but when the camera cuts, they're gone.

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Continuity mistake: The first time Tree is in the hospital, as she enters the room holding the ax with both hands, pay close attention - repeatedly between cuts, her left hand instantly rises and lowers several inches on the ax handle. This happens at least two or three times.

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Continuity mistake: When Samar stands up and introduces himself to Danielle in the beginning, he has churro crumbs on the side of his mouth. When he sits back down, they are suddenly gone. He didn't wipe his face off - they just vanish between shots.

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Character mistake: Zeke makes the bold claim that "John Kramer didn't target cops." This is completely and utterly false, and a cop like him should know better. Kramer repeatedly targeted cops. In fact, both "Saw II" and "Saw IV" have officers (Detective Mathews and SWAT Commander Rigg) as Kramer's main target.

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Trivia: There was a deleted scene explaining that the grown-up boys from the prologue (who beat up Jeremy at the dance) were found dead shortly before the events of the film, implying that they were also murdered, but it was cut for whatever reason. Ironically, this would have solved one of the major complaints audiences had with the film, which is that Jeremy is going after the girls who rejected him instead of the boys who bullied him - he was actually meant to be going after ALL of them.

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Continuity mistake: When Zeke gets to his apartment, as he puts away his gun, in the first shot his hand is still on the gun's grip... but when it cuts, suddenly his hand is about 6" lower on his holster.

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Audio problem: When Zeke is introduced and talking about Forrest Gump, he says the line "He beat China in ping-pong!" But if you look close, his mouth movements don't match the line. The same thing happens later in the scene when he mutters "f**k outta here, man."

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Continuity mistake: A few times during the opening trap, the barbed-wire around Bozwik's wrist disappears and reappears, or swaps wrists between cuts. Ex. When the train rounds the corner before he's hit, in the shot behind him you can see the barbed-wire flopping around in front of him... but when it cuts to the front angle, suddenly it's gone.

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Continuity mistake: Bozwik's teeth bizarrely change shape during the opening trap. In the first closeup, he appears to have slightly small teeth with gaps between them. But about 30 seconds later, there's another closeup and his teeth are suddenly larger with no gaps. All I can assume is that the two closeups were shot with different prosthetics or body-doubles.

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Continuity mistake: When Bozwik is watching his tape, when the recording says "Today, it is you who will be railroaded," Bozwik instantly goes from looking forward to looking upwards between cuts.

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Continuity mistake: When Samar leads Ryan into the lab at the beginning of the film, the door closes almost all the way. However, when the scene cuts inside the lab, the door is suddenly almost all the way open again, and closes a second time.

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