- Errors made by characters (possibly deliberate errors by the filmmakers): In the film, Erickson is constantly wearing a BlueTooth headset. When Hoffman calls him from Strahm's mobile phone, he answers the phone as normal, not using the headset. He appears to repeat this when he tries to track Strahm's mobile phone.
- Boom mic visible: In the scene when Jill (Betsy Russell) is talking to the FBI Agent in the Office, a huge boom shadow can be clearly seen above their heads
- Incorrectly regarded as goofs: In the bathtub trap room, the three surviving characters are told that they have three minutes to "bridge the gap" and unlock the door to the next room. A timer above the door shows 15 minutes, but this one is connected to bombs in the corners of the room (something not mentioned on the videotape); the three-minute timer is set up separately.
- Incorrectly regarded as goofs: The tank around Agent Strahm's head did not necessarily need to be airtight. It was secured in an upright position by two metal bars attached to the ceiling, and could therefore have had an air hole in the top panel that would not have prevented death by drowning.
- Crew or equipment visible: (At 00:09:40) On the unrated directors cut during the cube trap, while the camera is panning around you can clearly see the top of the set and see the ceiling of the studio they are filming in.
- Revealing mistakes: In the part where Agent Strahm is in the room where Jigsaw was killed, when he (Strahm) unveils his phone, he tries to phone someone. When it says 'NO SIGNAL FOUND' if you look carefully at the top-right hand corner, it has 3 bars of reception.
- Continuity: In the room with the mounted razor traps, a timer on the wall is shown to begin counting down from 15:00. However, a few seconds later Charles points to the timer, and it is shown with 15:00 on its display again. The beeping heard once the timer has begun also stops in the next few shots.
- Revealing mistakes: The magazine that the old lady is reading with the article "The 2 faces of Jigsaw" in the waiting room. Only the first paragraph is about Jigsaw, the rest is some article about parish houses.
- Revealing mistakes: The scans of Hoffman's sister's murder that Strahm looks at. Both the murder story (photo of slit throat) and the one of Hoffman at the funeral are exactly the same (making the second one nonsensical).
- Revealing mistakes: When Charles takes over breaking the hanging jars in the second room that the remaining four of the fatal five encounter, at one point you can see some of the rubber glass bouncing on the ground.
- Continuity: During the pendulum trap scene: When we see Seth's face for the first time, the collar around his neck appears to have a bolt in the center on the underside holding it closed; however, once Seth dies the collar opens and we see the bolt is missing.
- Continuity: In the scene when Jigsaw is talking to a tied up Hoffman, the doors in the background of Jigsaw's lair open and close between shots.
- Continuity: Maybe it's just the splicing in of extra footage into the director's cut, but when the first victim is getting sliced in half, it slices his body almost completely in half and then shortly after repeats the shot where his stomach is getting one of the first slices.
- Errors made by characters (possibly deliberate errors by the filmmakers): About 7 minutes into the movie, when Peter Sthram is walking through the building with his gun raised, and he is checking all of the corners in the building, he holds the flashlight on the wrong side. Police are trained to hold the flashlight on the opposite side of the gun, with the left hand going under the right hand. So, for example, if you are right-handed, the flashlight, held in the left hand, goes on the right side.
- Continuity: When John Kramer and Mark Hoffman are seen setting up the house used in Saw II, they clearly have no gloves on and therefore are leaving fingerprints over everything they are touching. This would clearly reveal at least Hoffman as an accessory to these crimes and he would have been identified very soon afterward.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Incorrectly regarded as goofs: SPOILER: At the very beginning when Seth is listening and watching the tape of Billy the doll the voice is clearly Jigsaw's (John Kramer). We learn later on in the film that Hoffman set this up and it wasn't Jigsaw. We also learn that Hoffman had not yet met Jigsaw at this point as well. However, it was explained by the director that the voice on the tape was technologically altered to sound like Jigsaw's voice. If Hoffman had used his own voice, he would have been identified and arrested by the people he works with.
- Incorrectly regarded as goofs: SPOILER: At the end, when Brit and Mallick are in the room with the saw machine, Brit realizes that all five captives could have survived to this point by working together in the previous three rooms. Billy's "odd man out" comment seems to contradict this idea, since the second room had only three bomb shelters that could be unlocked. However, it is stated that each shelter could have held two people; the "odd man out" would have been the person in a shelter by himself/herself. Further, there was the conversation about being able to predict human behavior. Hoffman predicted they would assume one person would die in each trap.
Related Links
