Continuity mistake: 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. (00:01:20)
Continuity mistake: 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. (00:01:50)
Continuity mistake: 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. (00:03:30)
Revealing 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. (00:04:20)
Continuity mistake: 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. (00:07:00)
Continuity mistake: 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. (00:07:50)
Continuity mistake: When Det. Matthews leaves Michael's crime scene, just before Kerry says, "Look closer, Det. Matthews," his tie changes position between shots. Note the position of the knot. (00:08:20)
Continuity mistake: In the office when Detective Matthews and Kerry are arguing, Matthews' gun keeps changing position on the desk with no-one touching it. (00:09:10)
Continuity mistake: The position of Det. Matthews' cigarette in the ashtray changes when he's arguing with Det. Kerry about her being the "Jigsaw expert." (00:09:45)
Visible crew/equipment: Crew is reflected in one of the large white SWAT vans which pulls up outside Wilson Steel factory. (00:10:50)
Other mistake: The drip-meter that is supposed to administer Jigsaw's 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. (00:13:50)
Suggested correction: It's not specifically stated that the machine is in use. That's just an assumption. It could be set dressing he's using to enhance the perception of his condition.
Continuity mistake: When we see the SWAT team aim their lasers on Jigsaw, we see several dots. A few officers move and 2 remain. However we still see 5 or 6 dots. (00:15:00)
Continuity mistake: In the scene when Eric Mathews goes to confront Jigsaw (after he first looks at the monitors), the chain of his badge gets twisted when he gets held back, but as he's about to leave the chain appears, untwisted. But when he gets back to the monitors, his chain is twisted only to be untwisted by him a few seconds later. (00:16:30)
Continuity mistake: Right after the guy gets shot through the door, it goes back to detective Matthew, and there is a small cut above his right eye. In the next shot it's above his left eye, then back. Meaning the shot is backwards. (00:25:10)
Continuity mistake: Jonas is listening to the tape again. When the door opens, the tape stops playing. But you don't see Jonas stop the tape, and there is more left on the tape as we have heard it before. (00:26:20)
Continuity mistake: When the people spot the envelope with Obi's name on it, the blade of the knife holding the envelope changes angle between shots. It goes from vertical to horizontal. (00:34:15)
Continuity mistake: When we see the envelope with Obi's name on it, the position of the knife through the envelope changes three or four times. At one point it is by the "b" in Obi and in another it's above the "o". (00:34:25)
Other mistake: 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. (00:38:10)
Revealing mistake: When Obi is getting burned, you can sometimes see the end of the oven at the side, for where the camera can see inside it. (00:41:20)
Continuity mistake: In the part right before the girl is thrown in the heroin 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. (00:49:30)
