I've wondered that, too.
On TPIR, I'd love to know how the spinning oval thing on the Magic # board works. And the Six-Ball table on the Gambit pilot. There are funky edits, so I wonder if it really worked yet. It seems pretty easy to aim at the letters in Gambit, for one thing.
I always wondered how in Safe Crackers the dials changed from black to red, until I saw the rather obvious answer that the numbers are on clear plastic. And there's the technological miracle of The Joker's Wild, but that's been explained, too.