It was a long time before I realized that only one turntable panel actually spun around, and that there were only two pentagonal panels, for that matter. I think Give or Keep is at least partly responsible for that confusion, in spite of obviously never actually seeing Give or Keep coming around the turntable. I guess my young mind figured it must've spun around regardless, and wasn't able to figure out why we didn't actually get to see it come around.
I thought Pick a Pair was a new game in 1990. While I remembered a game with a ferris wheel that had (as far as I knew) been retired, I didn't actually remember that game being Pick a Pair, so it just seemed like a brand new game to me!
I thought Squeeze Play was just like Double Prices in changing stage positions sometimes. Young me didn't consider reruns.
And of course, the dials in Safe Crackers being magic. Even as I got older, I still couldn't figure out how simple the color-changing illusion actually was. Not until I was an adult did I figure that one out.