Visible crew/equipment: Several times in the movie you can see a stunt double for Donnie Wahlberg, like when he tries to hang himself. Art runs over and there is a wide shot focusing on both of them. No slo-mo required, but you can see it's a stunt double.

Saw IV (2007)
1 review
Directed by: Darren Lynn Bousman
Starring: Tobin Bell, Betsy Russell, Costas Mandylor, Scott Gordon-Patterson, Scott Patterson
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(11 votes)
"Saw IV" unfortunately starts a noticeable downward trend in the series, as the crew shifted and new writers took over. While it still retains many of the series trademarks, including gooey, gory traps and unpredictable twists, "Saw IV" crumbles under its own weight. It's a little too over-produced and a hair to convoluted for its own good. Hardcore series fans will likely find some enjoyment in it, but casual audiences need not apply. 2 out of 5.
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Agent Strahm: We're here to find the person helping Jigsaw and Amanda Young.
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Answer: The chair wasn't actually electrified. It was just made to look that way in order to hide his involvement in the game.
Phaneron ★