As you're just watching these now, are there any other such obvious outliers that we see in Spock's expressions, other than his "Hello, glad to meet you. Uh, who am I exactly" introduction in WMNHGB? You didn't mention it, but did he leer in Mudd's Women, for example? He did get a little wound up trying to make the case to McCoy while he was working over Nancy, to no avail, in your last entry. I don't know, but that didn't seem too egregious.
The only moment I can recall is when Mudd's women first meet Kirk in his quarters and Spock is in the background leaning against the wall with a slight grin on his face. And when he leaves he gives Kirk a sassy look. There were other moments, but I can't recall when, where Spock would have a look on his face, or he'd make a strange comment, and it just doesn't quite feel like Spock. But early instalment weirdness is common in TV shows, and Leonard Nimoy had the responsibility of portraying an entire alien culture, so things like this are to be expected.
I seem to recall similar issues with Data early in TNG, especially that episode where he got drunk. Speaking of which (damn, I'm good at segues):
The Naked Time (****)
After my criticism of Harry Mudd's Irish accent in
Mudd's Women, some of you might have expected me to rip this episode a new one. After all, this is the episode where Paddy gets drunk, starts singing, and nearly crashes the ship. Isn't all that an offensive stereotype of Irish people? But Riley's accent is clearly American, and he perfectly matches most of the stereotypes that Irish people have of Irish-Americans. 1) He proudly declares himself to be Irish, even though he's clearly not. 2) He uses his ancestry as an excuse for his drunken behaviour. 3) He claims to be descended from ancient Irish kings (that once had their own castle). To complete the stereotype, all he'd need to do is donate money to the IRA, but I suppose the organisations using that name wouldn't last long beyond 2024.
Full disclosure: when I first watched TOS 7 or 8 years ago, I really struggled to get into the show for the first dozen episodes due to its dated production style, and I actually dozed off towards the end of this one. I still vaguely remembered what happened, but this was my first time seeing the whole thing fully conscious. And now I realised what I had missed out on. Episodes where the crew acts strangely are an infrequent trope used across the Star Trek franchise, and this episode itself was copied wholesale on TNG, but this is probably the best example of this type of story because it balanced the silly and the serious.
There's the silliness of Sulu taking his shirt off and prancing around the ship with a sword, but there's also the seriousness of of nurse Chapel expressing her love for Spock. There's the silliness of Riley taking control of the ship, but there's also the seriousness of Spock's breakdown as he struggles to control his emotions. There's the silliness of Kirk's overacting as he expresses his love for his ship, but also the seriousness of Kirk's overacting as he expresses his love for his ship.
The ending is a bit weird, what with the random time travel. I understand that this was originally supposed to be the first of a two-parter, with
Tomorrow Is Yesterday as the conclusion, and the time-travel ending is a remnant of that nixed idea. The episode would probably have been better without it.
MCCOY: The only reason he died, Jim, is he didn't want to live. He gave up.
Maybe he discovered that his husband had just slaughtered a bunch of younglings, that has been known to cause people to give up on life.