Factual error: After falling into the pit of needles, somehow all of the needles in Amanda's skin stay intact and do not break, despite her fall and her rapid digging through them. Very, very unlikely at best. (00:50:50)
Revealing mistake: When Amanda is slowly getting up right after being thrown into the needle pit, if you watch very closely, in one or two quick shots you can see a small pad on the actress' back used to hold the needles in place. Slow motion helps, but is NOT required. (Seen in Uncut version, though it may be in the theatrical version as well.) (00:51:10)
Continuity mistake: When Amanda is thrown into the pit of needles, in some shots there is only one, while in others, there are two or more stuck in her back. Also, in some shots the needles are pointed at an angle, whereas in others, they are pointed almost straight up. (Uncut Edition) (00:51:20)
Continuity mistake: After Amanda falls into the pit of syringes and is dragged out by Eric's son, she is covered in blood from being stabbed with many syringes, but in every scene after that she has no blood stains on her skin or clothes. (00:52:25)
Continuity mistake: The way Kerry is holding the files of the people in the game changes instantly when Matthews grabs the files from her. (00:56:25)
Continuity mistake: Eric sits down after finds out who is in the game with Daniel. When he does, the walkie-talkie on the desk simply disappears between different shots. (00:56:40)
Continuity mistake: When Glenn Plummer gets the spiked baseball bat in the head, the camera shows two shots of the blood coming out of his head on the floor, and there's not much there. When the guy who killed him walks over to read the number on the back of his head, there is now a huge amount of blood, not enough time has passed in the 2 seconds since the previous shot for this to happen. (01:00:00)
Revealing mistake: When the group finds the picture of Daniel and his father Eric in the house, look closely at the photo - it was obviously very poorly patched together with photoshop. The lighting on Daniel/Eric does not match the lighting in the background at all, and it's clear that they have been crudely "cut out" of another photo and inserted over the background image. The extremely poor, obviously fake quality of the photo is even jokingly mentioned in at least one of the DVD commentaries. (01:01:05)
Continuity mistake: The way Daniel holds the picture of him and his dad changes instantly. (01:01:25)
Continuity mistake: After Xavier kills Jonas with the spiked baseball bat, we see Amanda, Daniel, Addison and Laura in a hallway. Laura collapses to the ground due to the nerve gas that they've all been inhaling. Between shots her left arm moves from her stomach to across her right shoulder. (01:02:00)
Continuity mistake: The tape on the picture that Daniel has keeps changing. In some shots it's all nice and neat; in others it's curled up and taped to itself. (01:02:30)
Continuity mistake: When Emmanuelle Vaugier walks into the room with the clear box trap hanging from the ceiling, in the middle of the two hand openings is a syringe with the antidote. It is filled with significantly more in the close up shots, than there is in the full shots which show a lot less in the syringe. (01:06:00)
Visible crew/equipment: When Alison is in the hand box trap, if you look very carefully you can see a boom mic arm reflected in the glass in one of the quicker shots. No Slow-mo required. (01:07:00)
Continuity mistake: Right at the end, the amount of blood and cuts on Jigsaw's face changes when he is in the van with Det. Matthews. (01:10:30)
Continuity mistake: When Amanda and Daniel entered the bathroom from 'Saw', Adam's body is shown with his right leg shackled. However, in 'Saw' and in Adam's death flashback in 'Saw III', his left leg is shackled. (01:14:10)
Continuity mistake: After Xavier's had his throat cut, he grabs Daniel's shirt and his hand is completely covered in blood. The camera cuts away and then cuts back, and suddenly his hand is bone dry. (01:15:30)
Deliberate mistake: When Amanda is watching the guy cut the skin from the back of his neck, you can see the same shot repeated twice at the beginning and end of the ordeal. It is the zoom in shot of her just as she is about to start shaking her head. (01:16:50)
Continuity mistake: We figure out at some point or another in the movie that the people in the game are supposed to have numbers on their necks. (In the back of their minds). But in the scene where Amanda gets thrown in the needle pit Franky G's neck is seen as he walks past Glenn P. and as he walks out the door, with no numbers in either shot.
Continuity mistake: At the end when Det Mathews is in the same room as Saw 1, you can see the mirrors on the wall. Both are intact, when one of them was broken by Daniel in the first movie.
Answer: Daniel was in there the whole time...The events in the house took place MUCH earlier than when the police got there. Everything in the house was on a tape delay.
moviemogul