i'm still a bit confused by a lot of it

[spoiler]if it was all a simulation, then how exactly did their bodies survive in the real world? were they hooked up to some kind of feeding tubes?[/spoiler]

[spoiler]how could frank not know where these people were physically? wouldn't it be an insane risk not to find that out just in case?[/spoiler]

[spoiler]why did the cover story for the men's jobs have to be so mysterious as to arouse curiosity? wouldn't it have been easier to come up with a more mundane lie to explain what they do for a living and why it's dangerous to go there? like, i dunno, radiation or something?[/spoiler]

[spoiler]why did they make it so easy to exit the simulation? one just had to be curious enough to wander into the forbidden zone and touch this building - why didn't they put it further away from the town or hide it in a cave or at least build a fence around it?[/spoiler]

[spoiler]what was the deal with the airplane? why did alice see it?[/spoiler]

[spoiler]why did they care whether she took her pills in the simulation, when jack could just inject her with anything in real life?[/spoiler]