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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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Trivia: As of 2022, this is the only widely-released theatrical film to feature David Boreanaz in a starring role. His only other starring film roles have been in TV-movies, limited releases and direct-to-video movies. (Although thankfully, he is an incredibly successful television actor).

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Audio problem: During the final test, at one point Marcus says "Shoot this piece of s**t Ezekiel, now." In the first shot, it's clear he's saying something entirely different as his mouth movements don't match the dialogue. The scene then cuts to a closeup mid-line, and the closeup does match... but the first shot doesn't match in the slightest.

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Revealing mistake: When Gregory throws Tree through the window during the final fight, as Tree lands, you can see the outline of a stunt-pad on her thigh beneath her pants. You can also tell it's a stunt-woman, as her body is slightly stockier than Tree normally is.

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Continuity mistake: When Gregory reveals himself as the killer, pay attention as he walks towards Tree clapping. The mask on the ground behind him is initially face-down and right next to the wall. But a few shots later, suddenly it is face-up and has moved about a foot to the left.

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Continuity mistake: The second time Tree wakes up, she does a mock "gunshot" to her forehead using her fingers. She then turns her head downwards. When the camera cuts, she instantly goes from looking down to looking to her right. (You have to look closely since only part of her head is in frame, but it's definitely noticeable).

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Revealing mistake: When Tree accidentally runs off the hospital roof, you can get a quick but pretty clear look at the stunt-woman's face as she falls, right before she hits the ground. The stunt-woman's body is also very slightly stockier than Tree's actress Jessica Rothe.

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Continuity mistake: When alternate-universe Danielle is pretending to be blind in the food court, she starts to feel her hand around Tree. At one point, she starts to move her hand down Tree's back, but when it cuts, suddenly her hand is at the side of Tree's head.

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Continuity mistake: At the beginning of the basketball game, there's someone in a red hoodie and a baby mask sitting directly next to Ryan. A few shots later, you can see over his shoulder, and there's someone else entirely next to him - a woman without a baby mask wearing an entirely different top. Then, a little later in the scene, the person in the baby mask and hoodie reappears next to Ryan in a few wide-shots.

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