Continuity: After Amanda falls into the pit of syringes and is dragged out by Eric's son, she is covered in blood from being stabbed with many syringes, but in every scene after that she has no blood stains on her skin or clothes.

Other: In "Saw One" the pipe near the door on Larry's side has some green mold between it and the wall in "Saw Two" however it does not.

Other: In the crematorium trap, near the end of the scene where the doomed character dies, his jeans should be entirely burnt due to the flames, yet they are not. This was corrected however i have personally tested it. For the amount of time that this character was in flames his jeans would have turned black from the soot created when jeans burn. Test it yourself.

Deliberate "mistake": In the opening scene, the helmet closes on the guy's head. Inside there are spikes on all sides, but when his head falls to the ground the blood only comes out the bottom. The spikes should have also gone into the other side of his head and blood should have run down his face to the floor.

Continuity: When Glenn Plummer's character gets the spiked baseball bat in the head, the camera shows two shots of the blood coming out of his head on the floor, and there's not much there. When the guy who killed him walks over to read the number on the back of his head, there is now a huge amount of blood, not enough time has passed in the 2 seconds since the previous shot for this to happen.

Visible crew/equipment: Crew is reflected in one of the large white SWAT vans which pulls up outside Wilson Steel factory.

Continuity: In the part right before the girl is thrown in the heroine needle pit, Jonas takes the envelope with the drug dealers tape. When the cop's son pulls the cover off the pit, you can see that the envelope that Jonas just ripped off is still on. It's right near the bottom of the screen, and in the middle.

Continuity: When Amanda is thrown into the pit of needles, in some shots there is only one, while in others, there are two or more stuck in her back. Also, in some shots the needles are pointed at an angle, whereas in others, they are pointed almost straight up. (Uncut Edition)

Deliberate "mistake": When Amanda is watching the guy cut the skin from the back of his neck, you can see the same shot repeated twice at the beginning and end of the ordeal. It is the zoom in shot of her just as she is about to start shaking her head.

Other: The drip-meter that is supposed to administer Jigsaws medication is not turned on. Anyone who has spent time in a hospital and seen one for real knows that a lot of numbers are shown on the displays when it is running to show medication status.

Continuity: In the very beginning of Saw 2 when the informant awakes and realizes where he is and suddenly gets up from the chair there is a brief shot of him from the rear. If you look closely the leather waistband for the trap is completely loose, but when the camera quickly switches to his front, it shows the leather waist band tight around his waist.

Continuity: In the opening scene when the informant is about to cut into his eye they show a close up of the knife just centimeters away from his eye ball. There is minimal blood only in his eye but nowhere else, where in the cut before it the whole area around the eye is covered in blood.

Continuity: In the scene where Emmanuelle Vaugier walks into the room with the clear box trap hanging from the ceiling, in the middle of the two hand openings is a syringe with the antidote. It is filled with significantly more in the close up shots, than there is in the full shots which show a lot less in the syringe.

Continuity: When Matthews' friend is watching the puppet on TV at the beginning of the movie, the channel indicator on the television keeps changing from displaying channel 3 in one shot to being covered up with duct tape in the next.

Revealing: When Amanda is slowly getting up right after being thrown into the needle pit, if you watch very closely, in one or two quick shots you can see a small pad on the actress' back used to hold the needles in place. Slow motion helps, but is NOT required. (Seen in Uncut version, though it may be in the theatrical version as well.)

Continuity: After seeing the Jigsaw piece cut in the man's body, after Mathews stands up, the position of his body changes slightly between several cuts. He goes from looking downwards, to looking off to the sides, etc.

Continuity: When Mathews and the female agent are talking about the first victim, Mathew's head changes position slightly as the camera cuts back and forth. It is leaning to the right in one shot, then to the left in the next, etc. Very subtle, but it's there.