Audio problem: When Gideon says to Jill "get comfy" his mouth doesn't move. You can see the side of his mouth and it doesn't move. (00:35:35)
Audio problem: When Dina says to Ryan that she didn't love Brad, just him, there is one point where she says, "No, I never did." When she does, her mouth does match up for the word "No" but not for the rest. (00:06:05)
Audio problem: Hoffman sets fire to the Jigsaw evidence with a Zippo lighter. You hear him open the lighter and set fire to the petrol. He then leaves the lighter. But you hear the lighter click shut again. (01:17:40)
Answer: Dr. Gordon from the 1st movie, and Ryan and Brad from the trap in the beginning of this movie.
derrick g