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Continuity: When Tom (Charlie Sheen) is about to pick up the picture, you can see that the person on the right on the picture is on the far right of the frame. When it cuts to a close-up of the picture the person on the right has moved to the middle of the picture. In fact it's basically a different picture.
Continuity: In the shots when the Saw Villain is speaking to Shaq and Dr.Phil, we can see the two toilets right next to Shaq. Throughout the entire speach the toilet on the left has its lid down and the one on the right has its lid up. When Shaq shouts "Oh my God, how are we gonna get outta here", the toilet on the left has its lid up, and the one on the right has its lid down.