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Continuity mistake: Just as the second room trap comes to a close we see 9 seconds on the timer and hear it ticking down. We hear 4 ticks and then there are 2 seconds left. There should be 5. (00:37:20)

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Continuity mistake: When Ashley is decapitated, a pool of blood appears under her severed head. Later when we see the head from the second room, the pool of blood is not present. (00:26:50 - 00:33:30)

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Continuity mistake: When Strahm looks at the file and says "got you" he points at the 4th record on the list. Camera cuts and now he's pointing at the 6th. (00:29:10)

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Other mistake: Seth is told that in 30 seconds the pendulum will drop low enough to cut his body and in 60 seconds it will cut him in half. We then see the clock start ticking. After Seth has crushed his hands, we see the clock - 46 seconds have passed and yet the pendulum hasn't cut him yet. (00:04:35)

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Continuity mistake: At the very start we see Seth with the collar round his neck, connected by a bolt. When the collar opens at the end of the trap, the bolt has disappeared. (00:02:20)

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Continuity mistake: Spoiler: Right at the end, we find out that Saw III and Saw IV were happening simultaneously, as demonstrated by Strahm walking in and killing Jeff. We then see Hoffman close the door on Strahm, locking him in the room. Saw V continues from the exact moment when Hoffman shuts the door on Strahm. In Saw V, Strahm quickly kicks the door with his foot just seconds after Hoffman has closed it. However in Saw IV, we see Hoffman walking away. In this shot we should hear Strahm kicking on the door.

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Continuity mistake: In Seth's trap, the mechanism that is connected to the hand crushers is moving one way and then stops. When it continues, it continues the same direction. However the hand crushers now go up. (00:04:30)

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Continuity mistake: After the first room bombs go off, all the people are crouched on the floor and there is a load of dust. Camera shows Billy, then the people again. Now, there is no dust and everyone is stood up again. (00:35:05)

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Continuity mistake: When Strahm has just discovered the hidden door near the start, the position of the drips from the glow-in-the-dark gunk changes between shots. (00:06:45)

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Continuity mistake: When Jill is talking to Erickson, the height of the key on her chest keeps changing. (01:03:10)

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Continuity mistake: When entering the second room, the position of the door, before it gets closed, changes depending on the camera angle. (00:33:15)

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Continuity mistake: The shotgun that is positioned to Hoffman's throat changes position between shots. Note the gap between the barrel and Hoffman's throat. (00:41:05)

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Continuity mistake: The amount of blood on Alison's padlock in the first of the group traps changes instantly. (00:22:00)

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Continuity mistake: Jigsaw puts the razor down on a piece of paper and it is in a near right angle. When Hoffman picks the razor up, it is still at an angle. However, as soon as it's in his hand it's perfectly straight. There is no time for Hoffman to straighten the razor without us seeing him do so. (00:47:00)

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Revealing mistake: When Stahm is in the cube trap, there is one shot just before he sees his phone, gun, etc. and you can see a massive gap down the side of the cube where it wasn't shut properly. With the size of the hole, it would be extremely hard to keep water in the cube. (00:09:35)

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Continuity mistake: When Jigsaw's lawyer puts the opened envelope down on the desk, having taken the video out, he puts it horizontally on the folder. Camera cuts and it's now rotated 90 degrees instantly. (00:12:40)

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Visible crew/equipment: When the police cars arrive after Strahm's cube trap, there is a very quick shot of the black police car passing before the camera. When it does, a white screen and black stage light are reflected on its surface. This is just before it shows the SWAT going in. (00:10:45)

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Visible crew/equipment: When Jill Tuck is talking to Agent Erikson in his office, there is a shot with a boom arm's shadow visible across a picture and bit of wall, behind Agent Erikson. (01:03:40)

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Continuity mistake: When we first see Hoffman looking at the CCTV screens, we can see Ashley is lying down. When it shows her waking up, however, she is sat up. (00:20:20)

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Revealing mistake: When Strahm's phone says "no signal" there is actually a three bar signal. (00:06:35)

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