Corrected entry: In the very first scene we see Adam in a bath tub with his leg tethered in chains. Adam wakes up and jumps out of the bath. When the light is switched on we see that the chain attached to Adam's leg is just under a foot in length, which prevents him getting anywhere near the bath, let alone have all the slack to actually lie in it. This is illustrated when Adam leans over to the bath to get the bag with the photo in.
Corrected entry: When the two detectives break into the old factory and the drills start moving, why don't they just put something solid between the drills and the man's head to block them? They've got time to do so.
Corrected entry: throughout the entire movie the body in the middle of the floor (the dead guy) constantly changes his feet position, over and over - his foot is either straight down, up and bent, or to the side...
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.
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.
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.
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?
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.
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.