Corrected entry: Don't American police officers carry hand radios? Surely after Detective Tapp has his throat slashed the first thing his partner would do is call for backup and an ambulance.
Corrected entry: When Lawrence is telling Adam about Jigsaw, Adam appears to have absolutely no knowledge of the serial killer. However, a killing spree like that would be widely reported - it seems impossible that Adam would never have heard of Jigsaw and his crimes, especially as they happened in the town where he lives.
Correction: We learn from Jigsaw that Adam ignores life around him. He is just a voyeur and "spy" for hire so it is likely he just ignored all the reports of the serial killing. Adam also doesn't have any memories when he wakes up. It is only after Jigsaw shocks him that he begins to remember things so it is reasonable that he didn't remember any of the reports when the doctor is talking to him about it.
Corrected entry: At the end when we find out who the killer is, he can hardly walk because he is so weak. However, a short time later, he manages to slam a large heavy door shut without any apparent difficulty.
Correction: Surely the killer just appeared weak when he first gets up because he had been lying motionless in a room for 8 hours... in which case it is perfectly plausible he would have regained his strength quickly enough to slam the door.
Corrected entry: After Adam plays dead, he is electrocuted to prove he is still alive, presumably by the killer who they assumed was behind the camera. But at the end if turns out the killer was in the room all along - so who was electrocuting Adam? It couldn't be the killer, he remained motionless.
Correction: The killer has a small detonator type device in his hand, which when he presses it, electrocutes someone. We see him use it at the end when he points it at Adam. He could easily press it without the movement being obvious.
Corrected entry: When Adam realises there is a camera behind the mirror in the bathroom, he says, "It's a two-way mirror." Since you can only see through it from one side, surely he meant a one-way mirror?
Correction: There seems to be no standard term for these mirrors - one-way mirror and two-way mirror are interchangeable terms both used for mirrors of this nature.
Corrected entry: When Lawrence is reaching for the cellphone, he could've used the hacksaw to pull the cellphone towards him and answered it - finding out that his family was fine, so he never would've shot Adam.
Correction: He is panicking and arguably not of sound mind. He's worried about his family and desperate to get to the phone so he is not thinking rationally. Yes, it would have been easier to use the hacksaw but in an intense situation like that the best solution is usually not evident at the time.
Corrected entry: Included in the package of photographs Adam finds in the toilet, is the photo of Zep peering out the window of Dr Gordon's house. In a previous scene, however, we see that the picture was taken by Danny Glover. How did it get into the room with Adam and Lawrence?
Correction: The camera Danny Glover used was a video camera, not a still one. It's also from a different angle. Someone else took that picture, from below.
Correction: The picture in question was taken by Adam. When Jigsaw kidnaps Adam, he also takes all of the photos Adam had been taking of Lawrence and puts them in the bag that Adam finds in the toilet.
Corrected entry: If Zep had a "slow-acting poison" in his bloodstream, why did he play the game? Any rational human being (especially one who worked in a hospital) would simply have gone to an emergency room, had his blood analyzed, and been given an antidote. Game over.
Correction: Zep wasn't a rational human being to begin with. Also, anyone who found out there was a poison in their system, would want to get the antidote from the person who put it in there. There's no simple check for poison - without knowing exactly what it is, finding that out can take a huge length of time and finding an antidote could take even longer.
The survival rate of people admitted to the hospital due to ingesting an unknown poison is very high. Going to the hospital would have been a very smart choice.
Corrected entry: If you look at the revolver as Carey Elwes loads his single bullet at the end, notice all the chambers are empty. If the person on the floor had actually shot himself in the head, there would be at least one spent shell still in the gun.
Correction: *SPOILER* The person on the floor had NOT, in fact, shot himself, so where is the mistake?
Corrected entry: Near the end of the film, when Zep gets up from the computer/camera, the digital clock reads exactly 6:00 PM. However after he struggles with the wife and policeman, he runs past the clock and the time now reads 6:06 PM, even though only 1-2 minutes have elapsed in real time.
Correction: Most movies aren't filmed in real time.
Correction: Because of Danny Glover's obsession with Jigsaw, he tells the Asian officer to drop everything and help him out right away. They both go in very unprepared because Glover wants Jigsaw so badly and isn't thinking. Normally cops would plan the attack and go in full force.