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Trivia

During the flashback scenes at the drug clinic, pay close attention. There are several characters from the previous films in a number of the shots. They include Paul (from the razor-room in the original "Saw"), Gus (who was killed by the gun-trap in "Saw II"), and the unnamed man who Amanda killed in the original film, among others. See more...

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Saw IV (2007) - 4 major mistakes

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Genres: Crime, Horror, Thriller

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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.

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Continuity: The blood stain on Riggs' white shirt around the neck has blood under the collar, then at the end it is over the collar and has increased in amount.

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Deliberate "mistake": When Agent Hoffman writes the letter to Amanda, he puts the envelope so her name is pointing down, yet when Amanda opens the drawer her name is at the top. The director had to do this or it would have revealed Hoffman was the new apprentice all along.

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Continuity: When Agent Strahm has finally realised where the final game is being played, he holds up the piece of paper of Jigsaw and Art outside the Gideon building. There is a hand at the top of the picture, which is a newspaper clipping, but he is holding a picture, not a newspaper. This is a reused shot of when he shows Agent Perez the picture earlier in the movie.

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