Right, and they also have an underwater version of the outside of ISS ... thus explaining the air bubbles that regularly appear during NASA "space walks", as well as the occasional reflection of a guy in scuba gear reflected off an aquanaut's visor.

Someone isn't happy about it as they down voted. When the guy pointed out the ball toy they used I laughed, it really was the same.

Yeah, were it not for the ball, you could claim that, "Well, they use it for training."  That ball is a dead giveaway, since I doubt that playing with the ball is part of any training program.  Given that they have a lot of film where they appear to be somewhat "weightless", I'm guessing that they film the inside to use on the green screen projection/replacement, while the pseudo-nauts are actually hanging on wires in front of a green screen.  I recall a few funny ISS blooper videos where they drop stuff that falls and hits the floor with a clang (even though there's supposed to be low gravity).  It's just one joke after another.  Two of my favorites are 1) when you can see the a guy's large head behind a model of the Space Shuttle allegedly in space, and 2) the floppy doors in ISS that look like they're made of fabric.

Someone isn't happy about it as they down voted.  

Maybe they didn't like your 4 character word.