Saw IV

Plot hole: Rigg plays the woman's tape without rewinding it and it starts at the start of the tape. The woman would have listened to the tape to know the knife was under the TV. But why would she rewind the tape to the beginning after? (00:27:00)

Ssiscool

Plot hole: When Rigg is listening to the tape in the first hotel room, the tape instructs him to wear the pig mask in order to conceal his identity from the hotel cameras. Rigg wasn't wearing the mask when he entered the hotel, so putting the mask on after the cameras have already seen his face would do absolutely nothing to conceal his identity. (00:36:00)

Phaneron

Continuity mistake: 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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Eric Mathews: I don't want to play anymore.

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Trivia: The footage in the beginning of the movie that shows Jigsaw swallowing the wax-covered cassette was actually shot during production of "Saw III", but was not used in the final cut.

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Question: A glass casket with a key inside it is shown in John's warehouse. What does that mean?

Answer: It plays an important role in the next few movies.

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.

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