Continuity mistake: When we first see Kerry in the Angel trap her arms are down by her side. The camera zooms out and now her arms are raised. (00:13:15)
Continuity mistake: The key is bubbling when it first drops in the acid, and continues bubbling throughout most of the scene. As Jigsaw's message is winding down, the bubbling dies down and stops. But it's bubbling full force again when the detective goes to put her hand in the jar. (00:13:20)
Continuity mistake: The blood mark on Kerry's cheek changes several times. It's most easily noticeable when you first see her in the 'Angel' trap, and then a close up on her face at the 14:17 mark in the movie. (00:14:10)
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: When Kerry is in the Anglet trap, there is one point where her hand has almost grabbed the key out of the acid. The camera changes and her hand is nowhere near the key. (00:15:40)
Continuity mistake: Kerry's hand is severely burned from the acid, but in all following scenes her hand shows no burns. (00:16:00)
Suggested correction: They do show burns throughout the rest of the scene.
Continuity mistake: The acid is completely red after the woman puts in her hand. The acid jar is then completely clear throughout the rest of the scene. (00:16:50)
Continuity mistake: When Jigsaw says "You're already dead on the inside", the oxygen mask is resting on his chest. In the next shot he is holding the mask. (00:25:00)
Continuity mistake: When Jigsaw is saying about swallowing anti-depressants, his hand moves from his oxygen mask then back instantly. (00:25:10)
Continuity mistake: When Amanda tells Lynn "Let me give you the simple version" there are several hairs that are across Lynn's face, the next shot of Lynn has her hair back nice and neat. (00:27:35)
Continuity mistake: When Jeff is inside the box he kicks out 2 boards, when the shot cuts to the outside there's only one board missing. (00:30:55)
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: 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: 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: A little bit after you first see Jeff there is a shot of Amanda looking into Jigsaw's room. Lynn is telling Jigsaw to look at her. The pillow is about three-quarters of the way down Jigsaw's head, almost down to his neck. The shot cuts to a closer view of him and now the pillow in a good 8-10 inches higher on his head, up past his ears. (00:36:20)
Continuity mistake: Look at Jigsaw's oxygen mask first time Lynn tells him "Look at my flashlight". The mask is next to his neck, lying flat on his shoulder. The shot cuts to Lynn for a second, then back to Jigsaw, now the mask is standing vertical and almost touching his cheek. (00:36:25)
Continuity mistake: After examining Jigsaw, Lynn tells Amanda that he needs to go to a hospital. Amanda grabs Lynn's hair and pulls Lynn towards her to yell at her. In the shots of Amanda's face you can see that their foreheads are touching, but in the shots of Lynn's face their temples are the only thing that is touching. (00:37:25)
Continuity mistake: During Jigsaw's seizure there is a shot of Lynn when she's yelling at Amanda for help. In this shot she has several strands of hair that are across her face, but in the very next shot they are gone. She couldn't have brushed them away because her hands were on Jigsaw the whole time. (00:37:50)
Continuity mistake: When Jigsaw is coughing up blood, the blood in the mask disappears between shots. (00:37:55)
Continuity mistake: After Lynn looks for pills she runs back over and tells Amanda "Back off, back off", then takes off Jigsaw's oxygen mask and puts her hand on his face to keep his head to the side and you can see two drops of blood on her hand. The shot cuts to a closeup of Jigsaw and now there is no blood on her hand. (00:39:50)