So there we were, watching an old episode of "Star Trek," and we had this overwhelming feeling of Deja Vu... it all looked so familiar. And it was! It seems TV studios often recycle sets rather than build new ones. This episode, "City on the Edge of Forever" was filmed on the old Mayberry set from "The Andy Griffith Show." The Mayberry set was also used for the "Star Trek" episode "Miri." You can even see a corner of the Floyd's Barbershop sign.
Some others that might have given you that weird feeling: "Scrubs," "The Office", "The Sopranos" and "Six Feet Under" all used the same hospital set. And maybe my favorite, "Little House on the Prairie" recycled most of "Bonanza." You're not crazy... just observant.
And let's put those skills of observation to work in our bidding.