Continuity mistake: There's a shot of the right foot when "The Rack" starts twisting it. There is a blood trail that runs off between his first 2 toes, and a lesser one that runs off between his 2nd and 3rd toes. The screen cuts to a close-up of the foot and there's only the blood trail that runs off between the first 2 toes.
Continuity mistake: The guy that is in chains stands up, looks around and takes in what he sees. There's a shot of him from the front and his hands are semi-clenched in FRONT of him, around waist level. The shot cuts to behind him and his hands are a good 4 or 5 inches OUTSIDE of his hips. (00:06:35)
Continuity mistake: When Kerry is looking in the closet, she is right by the door. Camera changes has she has jumped about two feet back instantly. (00:12:30)
Continuity mistake: The blood streaks on the chained man's chest continually changes from almost covering his chest, to less noticeable. They probably tried to give the appearance of his continual bleeding, but the shots didn't make it into the movie in sequence. (00:06:25)
Continuity mistake: The knot and string position on the tape player is different during the close up of it on "The Rack" guy's chest than it is during the far away shots.
Continuity mistake: When Jeff sees the doll on the wrecked trike you can see that the doll's hand is on the trike tire, but in later shots (of the doll from the waist up) the wheel and tire and nowhere to be seen.
Continuity mistake: When Jeff reaches up and plays with his daughter's hair some of her hair falls over/in front of her stuffed animal. The next shot of her (instant cuts) and her hair is back behind the animal. (00:31:00)
Continuity mistake: Not only does the key in the acid stop bubbling, then start up again as Kerry's reaching into the jar (as mentioned in a previous mistake), but in almost every shot the key switches from bubbles to no bubbles. It also moves position from the back of the jar to the front of the jar. (00:13:15)
Continuity mistake: When Jeff comes in to his daughter's room the blanket that she has around her chin changes position from shot to shot. It goes from right next to her chin, the a few inches below it, all the way down to spread out on her bed. She doesn't change position in any of the shots, so she couldn't have pulled it off herself. (00:32:00)
Continuity mistake: In the first shot of Kerry watching the Jigsaw tape you can see 2 folders to her left. She fast forwards the tape a bit, the shot cuts back to her, and one folder is inside of the other. Also, all the pictures spread out in front of her change positions and placement drastically. (00:12:00)
Continuity mistake: Amanda's sweat marks and eyeliner runs constantly change shape and size (bigger, smaller, and back to bigger) during the bathroom flashback. (01:10:30)
Continuity mistake: The clamps on Jigsaw's head change their positions between the time Lynn says "He's stabilized" and "I need you to raise your hand and spread your fingers" The top one is most noticeable, it goes from hanging over his forehead to lying on top of his head.
Continuity mistake: The blood splatters on Lynn's face change throughout the whole brain surgery scene. The splatters go from defined, to smeared, and then back to defined again a couple different times. (01:03:15)
Continuity mistake: In one shot, when Kerry is in the 'Angel' trap, her right hand is on the chain. The shot cuts away to an over-her-shoulder view and her hand is off the chain. The shot cuts back to show her and her hand is back on the chain. (00:15:10)
Continuity mistake: After the scene of Tony there is a shot of Kerry and Rigg, the detective is in the background inspecting a piece of the chain. The shot moves to the background detective for a second and he looks up at something. The shot instantly cuts back to Kerry and Rigg and the background detective is suddenly looking down at the chain again. (00:10:25)
Continuity mistake: The positioning of Amanda's green sheet changes drastically during her cutting scene.
Continuity mistake: The red cloth (bag?) that's covering the gun changes its position DRASTICALLY between the first time you see it (then he talks to his daughter when she comes in the room) and then the second time you see it. The first time the back half of it is folded back over itself and it's almost tucked under Jeff's leg. The next time you see it it's completely spread out flat. Jeff didn't rearrange it while he talked to it daughter, it just "magically" happened. (00:33:00 - 00:33:55)
Continuity mistake: While Jeff is contemplating burning his son's possessions his hair constantly changes from messed up and down, to pushed up and away from his face. One of the shots you can see Jeff put his hand to his forehead in agony, so this explains that part of the hair change, but the changes happen several times during the same scene.
Continuity mistake: The length of the cut on Jigsaw's neck changes constantly throughout the final scenes.
Continuity mistake: Jigsaw gets "blood" all over the top and sides of the lid of phosphorus paint, yet there is hardly any "blood" on it when he throws it in his bag.
Answer: Adam didn't just lose because he let the key get drowned. He had the two hacksaws and he broke his own in a hurry. And there was also the toilet lid that he could have used to smash his foot like Eric did in Saw III. Jigsaw never said that improvising or thinking outside the box was against the rules. So even if you wipe the key out of the equation, Adam still has at least two other ways to release himself from the chains.
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