Corrected entry: When Rigg awakens and his test starts, he is shown a video clip of Detective Mathews and Hoffman in their trap, and both are wide awake and looking around. Yet, only a few minutes later, we see the room that they are in, and you see them passed out before waking up for the first time. (You can tell they are waking up for the first time in that room based on their reactions and flashbacks.) This makes no sense, as they were wide awake in that room just moments earlier on the video.
Corrected entry: When Jill went to get Cecil's jacket, she didn't lock the door behind her, yet, when Cecil forced himself in, he had to unlock the door to get into the same room his jacket was in.
Corrected entry: Rigg pulls the red scarf off the blonde woman and we don't see where it goes. Then there are two closeups of the woman where the scarf is nowhere in sight, and she has nothing on her left shoulder. Then in the next shot, suddenly the scarf is covering her and the machine behind her, and part of it is draped over her left shoulder.
Corrected entry: When the guy with the mouth stitched shut has put his legs against the machine to avoid being pulled anymore, a few seconds later you see him with his mouth open, enough for him to easily say something. At the end of the scene you see him being able to open his mouth easily, something he could've then done much earlier. And even if say his tongue was cut out to explain him not being able to say anything with an open mouth, he wouldn't be able to scream at the end either.
Corrected entry: When Agent Hoffman writes the letter to Amanda, he puts the envelope so her name is pointing down, yet when Amanda opens the drawer her name is at the top. The director had to do this or it would have revealed Hoffman was the new apprentice all along.
Corrected entry: When Agent Strahm has finally realised where the final game is being played, he holds up the piece of paper of Jigsaw and Art outside the Gideon building. There is a hand at the top of the picture, which is a newspaper clipping, but he is holding a picture, not a newspaper. This is a reused shot of when he shows Agent Perez the picture earlier in the movie.
Corrected entry: Most of the events of Saw IV take place during the same time as Saw III. They all involve the Jigsaw Killer. The police see the Jigsaw Killer as the source of the crimes in both movies. In Saw IV there is a completely different set of detectives working on the case as Saw III, despite being the same crimes.ujeremy
Corrected entry: Discussing Detective Kelly's death, the two FBI agents assert that John Kramer's 'apprentice' Amanda could not have lifted Kelly in to her trap. However, this scene takes place before the bodies of Kramer and Amanda have been discovered. Therefore this announcement of Amanda's involvement comes before the authorities have any evidence of her involvement. This inconsistency is masked by the fact that the film begins with a 'flashforward' to Kramer's autopsy; however the rest of the film's action takes place prior to the autopsy and therefore prior to the discovery of Amanda's role.ronnie_turford
Corrected entry: At the beginning, the guys at the morgue find the tape in Jigsaw's stomach because they are cutting him open. But at the end, when the detective goes into that locked room and kills the guy who shot Amanda in Saw III, Jigsaw's body is still in that room. So the guys at the morgue can't cut him up, if he was still in that locked room.logan crews
Corrected entry: When Rigg awakes from the bathtub in his apartment, he grabs the sink. He only leans on it gently, and the whole thing nearly comes off the wall, revealing that it isn't attached to the wall very securely. He learns on it quite hard, but not hard enough to pull it off the wall.
Corrected entry: When Rigg is talking to the little girl, he says, "How did you get those marks on your arm?" Later, in his flashback, he says, "How did you get those marks on your hand?"
Corrected entry: In the investigation of the "spike trap" scene, the rod (and the shadow of the rod) can already be seen through the left side of the crime scene photographer's neck before it even enters.
Corrected entry: *Spolier*When it is revealed that the events of "Saw III" and "IV" are running concurently, we are shown that the climaxes of both films supposedly occur simultaneously in under four minutes (as evidenced by the countdown clock that Rigg sees). However, if you re-watch "Saw III", you will see that the climax of that film takes about 10 minutes to transpire. In other words, it would be impossible for everything we see at the end of "IV" to actually happen as depicted, because there is too little time. (You can also tell that they edited parts of the dialogue and sound effects when Strahm is listening to make it seem faster.)
Corrected entry: When Eric Matthews is standing, just before he dies, look at his mangled leg with the leg brace. As Eric wiggles, you can see the skin of his real leg, perfectly healthy, underneath.
Corrected entry: The reading of the 'stomach tape' after the autopsy changes considerably between the first scene of the movie and the last.
Corrected entry: The trap is set up for Riggs to open the door and kill Matthews, but Artie comes through the door first with the trap already set up, so shouldn't Artie have killed Matthews when he came through the door first?
Corrected entry: In the opening "Blind and Mute" trap, when the machine in the middle starts to pull at them both, the mute's chain is pulled taunt and causes him to pull back at it. After he notices the key on the back of the blind man's neck, he suddenly has plenty of slack on his chain to go all the way to the side of the machine and battle the blind man.
Corrected entry: In the scene when Cecil is trying to get into the clinic and fakes that he left his coat, Jill turns around and unlocks the door to the waiting room, grabs the coat, and hands it to Cecil, who then charges into the room and demands the keys from Jill. Why would he need the keys if Jill never relocked the door? He was watching her the whole time, so he would have known.
Corrected entry: The two ice-blocks that are suspended from the ceiling (that kill Mathews) were present the entire film. However, it is impossible that nobody would have noticed them, as they would be melting at least lightly, causing water to drip down and make noise. Also, they are rigged to a series of wires and pulleys that would have literally been impossible not to notice.