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.
More mistakes in Saw IV
Eric Mathews: I don't want to play anymore.
More trivia for Saw IV
Question: A glass casket with a key inside it is shown in John's warehouse. What does that mean?
Answer: This was revealed by director Darren Bousman to have originally been used in a now-deleted (and not released as of Oct. 2020) scene in the movie. The glass box is used for what is (most likely) a different purpose in Saw V.
Answer: It plays an important role in the next few movies.