Continuity: The key is bubbling when it first drops in the acid, and continues bubbling throughout most of the scene. As Jigsaw's message is winding down, the bubbling dies down and stops. But it's bubbling full force again when the detective goes to put her hand in the jar. (Time) Submitted by Nick Bylsma

Continuity: The acid is completely red after the woman puts in her hand. The acid jar is then completely clear throughout the rest of the scene. (Time)

Continuity: When Jigsaw is coughing up blood, the blood in the mask disappears between shots. (Time) Submitted by Duff "King Of Beers" Mckagan

Revealing: When Lynn is inspecting the "reverse bear trap", the trap Amanda was placed in for the first movie, you can see a small orange light reflecting off a few surfaces, like Lynn's arm and the nearby table. This is the brightness level auto-adjustment light that is present on many handheld cameras, which the cameraman apparently forgot to cover or turn off. (Time)

Revealing: It's obviously a fake head when the doctor is drilling the skull as indicated by the increased amount of hair as compared to facial shots of Jigsaw. (Time) Submitted by William Bergquist

Continuity: After the scene with the pig gut pit, the characters leave the room and their clothes are suddenly not wet and perfectly clean. Submitted by Jennifer