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Continuity mistake: When Valentina grabs the wire in front of her neck and cuts her hands, the blood pattern changes between cuts. (There's suddenly less blood in the second shot, revealing it's a different take.)

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Continuity mistake: When Gabriella is kidnapped, as Amanda approaches the door of the stall she's in, the way she's holding her purse changes between shots. When it cuts to the angle above, the straps go from over her hands to under her hands.

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Visible crew/equipment: When John returns to the clinic to drop off a gift for Gabriele, when the cab pulls up, for a split second, you can see what appears to be the reflection of a crew member (likely part of the camera crew) walking in the green doors right before John opens his door. (It's very hard to see, but you can see it if you pay close attention.)

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Audio problem: When John wakes up after the surgery, his lines "Hemoglobin's normal" and "After that, what happens then?" are obviously dubbed in after the fact. His voice is much louder than he appears to be speaking, revealing that they were re-recorded during post-production.

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Continuity mistake: When John is fixing Carlos' bike wheel, throughout the scene, it is leaning backwards towards John. However, right before he pulls it out of the vice, it is suddenly leaning forwards towards Carlos. (John never pushed it forward.)

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Continuity mistake: When John puts Carlos' bike wheel in the vice, his right hand goes from cranking the vice to holding the side of the wheel as it cuts to Carlos.

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Continuity mistake: After Cecilia points out Carlos and his father to John while showing him around, they begin walking again. John goes from walking a few feet behind Cecilia to right next to her between cuts.

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Continuity mistake: When John is watching the video of Cecilia, he reaches up and puts his right hand against his face. It then cuts to the opposite angle, and suddenly it's switched to John's left hand being against his face.

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Other mistake: When John is watching the video of Cecilia on her website, the video progress bar we've seen twice makes no sense. The first time we see it, it's moving far too fast for the length of the video. Later, we see it a second time, and it has seemingly reset back to the beginning despite it being the same video, and again, it's moving way too fast.

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Stupidity: If you pay attention to John's computer desktop, it's hilariously clear that it's just a mockup made for the movie. There are about a dozen files on his desktop that literally just say "File." Every icon has an unrealistically generic name. Etc.

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Continuity mistake: When the custodian twists the dial to position two on his trap, his fingers go from extended to curled instantly between cuts.

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Continuity mistake: When the custodian grabs the watch out of the drawer at the start of the film, the way he's holding it changes instantly between cuts. (First he's only holding it in his right hand, then he's suddenly holding it with both hands.)

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Continuity mistake: When the custodian parks his vacuum near the hospital bed at the start of the film, in the first shot, his vacuum is near the middle of the bed. The camera cuts, and suddenly it's down near the foot of the bed.

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Audio problem: When the CT technician asks John if he'd like some help getting down, John says "Thank you very much", but you can tell that he's not saying anything and that the line is just dubbed in. (True, the camera is facing away from him, but his jaw and face aren't moving at all.)

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Character mistake: John would have no reason to ask the CT technician if she had any results. He says "that was a long one," indicating he's had this done before and should know it typically takes around 24-48 hours to get results. (Likely just a line of dialogue added for the benefit of the audience, who may not know.)

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Trivia: The doctor on the surgery DVD John finds in the ransacked clinic is actually the film's production designer, Anthony Stabley, in a cameo appearance.

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Trivia: Director Kevin Greutert has stated that the film was made with the intention of it being Tobin Bell's swan-song in the role of Jigsaw, and a proper send-off for the character, though he stressed "never say never" when asked about a sequel or Bell possibly returning in the future.

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Trivia: Director Kevin Greutert is one of the only crew members to be directly involved with all ten movies. He edited "Saw" 1-5 and "Jigsaw," directed "Saw VI," "Saw 3D," and "Saw X," and was an executive producer on "Spiral: From the Book of Saw."

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Trivia: An assistant editor was working on a cut of the "Eye Vacuum" trap one day when the doorbell rang. He was shocked to find police at the door. Turns out, someone in a neighbouring building overheard the edit and misinterpreted the screams in the footage as someone actually being tortured to death, so they called the cops. The officers were very amused when they found out he was just editing a movie. Director Kevin Greutert later joked, "It must have been a pretty realistic performance!"

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Continuity mistake: Henry writes down the web address "theperdersonproject.net" on a napkin for John. In the next scene, when John checks the napkin, the writing is slightly different. It almost matches, but a few of the letters are ever-so-slightly bigger or smaller, and the spacing is subtly different.

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