I honestly think the 60s special effects are one of my favorite aspects about TOS. They’re silly and corny and the suspension of disbelief is nonexistent but it wouldn’t be the same without them. That, and also the dramatic lighting in the closeups and the extravagant eye makeup on literally everyone lol.
Not sure of all the details, but the guy the production hired to give them information on customs/culture to use in the show turned out to be a total sham, for one.