*SPOILERS* Things that made no sense in Jigsaw *SPOILERS*

I enjoyed Jigsaw however there were several things that blatantly made no sense to me and I thought I'd list them here. Warning there will be spoilers.

1. How did he collect the bodies. Okay so just for clarification at the end of the film it is revealed that the film takes place across 2 times. The game being played 10 years ago that was not when Jigsaw was alive but also his first true game and also in the present day where a police coroner sets up an identical game to see if he can be as good as Jigsaw who was his mentor. Throughout the film we are led to believe that they are happening at the same time as after each person in the game dies a new body turns up when in reality the bodies are those of the victims of the new game who we never even see play their game. With that out the way my question is this. How did the get from the game to the open without any of the players noticing somebody dragging out the corpses? Not only this but how did he know that his game would play out just like Jigsaws did? He clearly just presumed it would as he planned to make them appear identical.

2. What's with the technology? Saw 1 was filmed and set in 2004 and the game played in Jigsaw was set before all of that so how is the technology so good compared to the others. In the first films recordings are shown on box televisions in low definition using tape recordings and yet in Jigsaw the videos are show on flat screen TVs using fancy video effects. So how did it all change so suddenly? I get that they wanted to make the film look modern but this makes no sense when its set in the past. Even the Billy Puppet has an upgrade with electric glowing eyes that make no appearance in any other film that is meant to be set after it.

TV in Saw 2

VS TV screen in Jigsaw

3. Why are the traps so complex? I get that John Kramer is meant to be an engineer but in all the other films his traps get more and more complex. The idea being that he increases his skills over time and yet not only does he seem to make some of his most complex traps ever in Jigsaw but he also seems to have access to much more advanced technology and equipment. He's gone from peeping through holes in the wall to using CCTV in Jigsaw as well as flat screen TVs instead of Box TVs. Where did all this technology go. Not to mention that the materials he uses are far higher quality.
Going back to the element of skill it is so unlikely that he would be able to create traps like this back then. The only trap we see him use before these is his knife chair trap which literally falls into pieces mid use. How does Jigsaw go from these complex traps and then a year later all he can come up with is locking 2 people in a room while he pretends to play dead?

Jigsaw Trap

Saw Trap

4. He has no plan if more than 2 players survive to the final game. The final game involves 2 people in a room with a shotgun loaded with a shell being told that the shell is the key to their survival. They thing they have to shoot the other person but little do they know the keys to their chains are literally in the shotgun shell so when the gun is fired it backfires killing the user and destroying the keys. The problem is that the game only works with 2 people. He only made 2 keys, there are only 2 places in the room to chain people and the shotgun game only works with 2 people. So what would he have done if more than 2 survived?