Corrected entry: The saw that Larry threw in the first film is straight and level near the wall. However, in this movie, when Daniel looks down the saw is now at an angle and much further away from the wall.
Corrected entry: As we all know from watching "Saw" or "Saw 2" the mastermind behind all the traps is a cancer patient. He could barely finish a sentence without coughing up a lung. Even while recording the messages on the tapes, he could hardly suppress his coughs. Yet somehow he manages to lay in the middle of the room the entire time and not cough once.
Corrected entry: In Saw, after Zep dies his feet are stretched out. However in Saw 2, his legs are now bent. It is highly unlikely that Adam would have moved him.
Corrected entry: 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.
Corrected entry: Jigsaw says he's never killed anyone in his life, but in the first Saw, when Detectives Sing and Tapp find Jigsaw's lair, Sing chases him and hits a trip wire, causing several shotguns to go off, killing him. Sing didn't know about the trap, therefore had no choice. So Jigsaw killed him.
Corrected entry: When Eric calls Daniel in Jigsaw's hideout, he discovers that Jigsaw has changed Daniel's voicemail tone. However, several times before that, Eric tried to contact Daniel to apologise for an argument they had, without receiving the different voicemail tone.
Corrected entry: In the first scene where the man has the death mask on, the x-ray shows that the key is in his left eye as when you are looking at the X-ray the key is on the right. However the mans eye that is bloodshot is his right eye and is also the eye that he is cutting into.
Corrected entry: 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.
Corrected entry: Not massive trivia, but a little interesting: When Eric and Jigsaw are going down the elevator at the end, it shows a shot of the lift from above. In Hollow Man, when Cain goes down the elevator after he finds a stable DNA bond, it shows the lift from above too, and it's exactly the same as what they use in Saw 2. It's never mentioned by Darren Lynn Bousman, but I'm sure it's the same elevator - check it out.
Corrected entry: Towards the end, as the cop moves through the house and sees the door in the floor by the bodies, you can see a full syringe on the floor. Where did this come from? At no point did anyone in that room get hold of a syringe, and even if they had, they'd have injected themselves with it. It can't have been used for anything, as it's full.
Corrected entry: When Xavier opens the door to the room with the needle pit, right when he gets the door open, there is a shot of the pin coming out of the timer which reads 4 minutes. It cuts to Xavier then back to the timer which now reads 2 minutes 58 seconds. (00:50:55)
Corrected entry: When Mathews is being brought to the scene of the opening murder, the female officer turns to face him, and between cuts she moves significantly closer to him than she was.
Corrected entry: You can tell the finger agent Mathews breaks on Jigsaw's hand is a fake prop as it does not move at all in the shot until it is broken.
Corrected entry: After John tells Eric Matthews that they have two hours left before the gas affects them, they show the clock reading 7:30. In a later shot they show the clock reading 8:30. But in later shots when Eric is slamming papers down on the desk in front of John, the clock now reads 8 o'clock.
Corrected entry: How did the safe in the beginning room open? It is seen open when the cop ran through the house. Nobody knew the full code. Besides, Xavier was the only one who knew about the codes, besides Amanda, and was looking for them. Amanda couldn't have opened it because it was still locked when Xavier passed through the trap door.
Corrected entry: After Amanda gets the key from the pit of syringes, she throws it up to Xavier, who frantically tries to put it in the lock, but drops it, and the time expires and the door locks. There was a syringe with a green liquid in it attached to the key, and, seeing as how all of the other presumed antidotes were green, that one probably was as well. So, why didn't anybody inject it? Out of all the people there, at least one of them should have noticed it, especially Xavier, since he was obviously the most anxious person to get an antidote, and he was the one who was handling it.