Continuity mistake: The red "blood" marks on Jigsaw's left hand change several times (smaller, larger, smaller, larger again) during the bathroom flashback. (01:11:10)
Continuity mistake: When Amanda goes to take off Adam's boots (in the flashback) his feet are spread a good 2, 2 and a half feet apart, yet when she goes for his right boot his feet are all of a sudden less than a foot apart. (01:11:30)
Continuity mistake: Amanda freaks out and pins Lynn to the wall after Lynn says "He doesn't even know you're there". Amanda's hand is around Lynn's neck, choking her. The screen cuts to Jigsaw very briefly (all he says is, "AMANDA!"), then back to Amanda, now Amanda's hand has moved up to being on Lynn's chin. Not only would moving her hand from Lynn's neck to her chin not serve any purpose, but the screen cuts happened too fast to allow for the hand movement. (01:14:25)
Continuity mistake: In the close-up when Amanda goes to suffocate Adam with the plastic, the plastic only goes up to his forehead, yet when the scene cuts back (instant cut) the plastic is completely surrounding his entire face and head. (01:16:50)
Continuity mistake: After the scene with the pig gut pit, Jeff and the judge leave the room and the judge's clothes are suddenly not wet and almost clean. (01:17:15)
Continuity mistake: Right before Lynn says "I don't know what you know, but my marriage has survived more suffering that you could possibly imagine" her hair is all pulled back behind her ear. As she's saying that line you can now see that a noticeable amount is hanging on the side of her face and across her ear. (01:25:50)
Continuity mistake: When Lynn says "Please, please let me go" there are tears in both eyes and tear marks on her cheeks. 2 shots later (maybe 7 seconds) you see a close-up of her face and there are no tears or tear marks. (Jigsaw was holding her hand, so she couldn't have wiped them away, plus you can see Lynn the whole time (in the background) and she never wipes them off). (01:26:10)
Continuity mistake: Jeff lays his bloodied hand right in the center of Jigsaw's chest (pointing towards Jigsaw's chin) when he says "I forgive you", but pretty much only his fingertips touch Jigsaw. Right before Jeff slices Jigsaw's neck you can see the handprint, but it's MUCH more defined than it should be AND the fingers are pointing towards the right instead of straight up. (01:42:10)
Continuity mistake: Just before Amanda shoots Lynn her gun switches from her right hand to her left.
Continuity mistake: Lynn is in the corner of the room when Amanda is threatening her with the gun. The shot moves to behind Amanda when she raises her hand to her head and now all of a sudden Lynn is a good 4 or 5 feet to her right. (instant cut, not enough time to move).
Continuity mistake: The glowing "X" on the bathroom wall in the first Saw movie was very symmetrical, and the whole thing was filled in very well. During the Saw III bathroom flashback scene, when Jigsaw paints the "X" it's completely different that the one that shows up in Saw. It's not symmetrical at all, and the paint doesn't go on very thick at all. You can easily still see the wall behind the paint, but in Saw, the lines of the "X" are very full with no gaps.
Continuity mistake: Jeff sees the 3rd tape player (in the room where he finds the judge) and there's a shot of the player being held up by string. The player is hanging very level and the string is perfectly tied around the middle of it. Jeff climbs the stairs to get the player and now you can see that the player is hanging crooked and the string (where it's tied) is slanted towards the top of the player. (He didn't shake it lose or anything when he climbed the steps, the player is hanging from the ceiling).
Continuity mistake: When Jeff leans down to Lynn you can see she she has some blood on her chin and neck. The shot goes to Jigsaw, then back to Lynn and Jeff. Now her neck and chin have no blood. Shot moves to Jigsaw again, then back to Jeff and Lynn. Now she has blood on her neck and chin *and* blood from the corner of her mouth.
Continuity mistake: After Lynn gets shot her position against the wall changes between the far away and close-up shots. (look at the poster she's leaning against for a reference point, in the far away shot her head is between the 2 legs on the left, but in the close-up her head is on the very left leg and you can easily see the right leg.).
Continuity mistake: The blood spots on Jigsaw's hospital bed disappear during shots of him telling Amanda to let Lynn go, and they reappear in later scenes.
Continuity mistake: When Jeff is screaming at the guy in "The Rack" there are a few spinning shots of "The Rack". You can see that the guy's arms aren't broken, even though you've seen them both be twisted until they snapped. (Slo-mo helps but is NOT required).
Continuity mistake: When Amanda says "I'm standing right here" her hair is hanging down, but brushed back from her right eye, in the previous and subsequent shots her hair is hanging down and covering her right eye. She was holding the gun in her right hand the whole time and all the cuts were instant, there was no time to move her hair.
Continuity mistake: The green tube that's connected to Jigsaw is gone when he says "Suffering? You haven't seen anything yet", but it was there in the previous scene and it's back the next time you see him.
Continuity mistake: Amanda's holding the gun in her right hand in every scene when she's arguing with Jigsaw, except when she's saying "It's all BS," then the gun is in her left hand. It's back in her right hand then very next scene (all instant cuts, no time to switch hands).
Continuity mistake: Amanda's hair is in a lose ponytail when she sees Jigsaw holding Lynn's hand. A large part of her hair is hanging down the right side of her face and in her eye. She storms out of the room and now all of a sudden her hair is all pulled back in a tight ponytail and no hair is hanging down or behind her ear, it's all back in the ponytail (instant cut, no time for her to re-do her hair).
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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