I simply adored and was awed by "The Changeling" as a kid. How did they get the thing to float? One day, when I finally grew up and became a Toys-R-Us kid since collecting action figures since then is generally more of a thing for adults, I perchanced a rewatch of this episode, and... Zoiks - it's bloody awful, isn't it. The rampant sexism was a huge turnoff. The machine magically bringing back Scotty and forced dialogue about wiping Uhura's memory were just so cod and phony... Nomad's ferried on a string quite craftily, or on a trolley cart, and with cut shots to hide the trickery. It's still very nicely done. Though why they used red, blue/green, and yellow filters... is Nomad also an officer in Starfleet? Or a new traffic control device in testing phase?! And as much as Jackson Roykirk is still cool, James T Kirk nagging it to death is about as laughably bad as anything from the era could get. Yet it's still funny.
"I, Mudd" really had me going as a kid. Mudd is back and better than ever before and by leagues! Funny scenes! Best episode ever!! As a teen (but eventually as an adult), the line of Chekov getting all excited because he could go at it with robot bodies went over my head and I wish it stayed there because people are where it's really at. And scores of other reasons. Yes, in part because I wanted to see more of Norman's sweatpants and not realizing why. I'll save that for later, it's a tad more complex... But fully as an adult, I witnessed how there must have been a real good sale on shower curtains for costumes (which still look great but I finally noticed they were shower curtains), and genuinely lame stuff such as more reused sets than in Lost in Space (even props in sickbay), one-dimensional dialogue even for 1967 standards, the twins were also in the worst-ever Batman episode, McCoy/Spock banter missed the mark by miles as well as not fitting into the show the way most of their arguments feel germane with (was the story subtly mocking its own franchise, perhaps)... and, of course, Stella/Harry's marriage is a stereotype cartoon leftover from 1955 - though why she would want to stay with him takes a real iron will and now there's 500 more of them so there you go... imagine that, a machine nagging a person to death - it's the inversion of the "Kirk nags computer to death" trope and one could argue Mudd is the anti-Kirk... again, show is mocking itself - it should just be content in letting the fans do that... But back to a good and big point: I think the actor who played Norman also, a few years prior to doing Star Trek, time traveled to the future to do that episode of "Spin City" made three decades later:
https://spincity.fandom.com/wiki/Snowbound because the dude looks similar... at least from what camera angles allow for...