I'm late to the party for last week.
A few things that are small but interesting to see, it shows a lot of dedication by the people involved in making the show.
When discussing Darnell's death by his corpse, everyone is sweating but Nancy.
When McCoy says he doesn't want to put it over the speaker to Kirk, Uhura seemed startled slightly right after giving a good indication who else can hear Kirk's chair-arm speaker. Actually Uhura was great in this episode, the scene when the monster tried murder her was very good and I also like Sulu's reaction when Uhura runs into the lift.
The marks on Spock after he is assaulted by the monster the first time.
I'm not sure who could have distinguished these things when broadcast as tvs were much smaller and much lower definition, not to mention many were black and white. But they put the effort in anyway, like making pink celery.
There's so much activity going on on the ship in this one, I love these early episodes where I really could believe there is 430 people on the Enterprise.
A very good scene in sick bay, Kirk discussing Darnell's autopsy results with McCoy, then the follow up when Kirk apologizes. It really shows their friendship but also shows that Kirk won't let friendship interfere with the working relationship.
I also like how concerned Kirk is over the loss of his people, too bad some future episodes neglect this.
The Salt Monster is interesting, not just a typical monster, it kills with the aid of some kind of telepathy and a paralyzing effect which leaves the victim helpless. The monster is ruthless, cornering and murdering at will. I wonder if the artifacts on the planet were not from those creatures but the civilization they destroyed in their hunger. It didn't seem that intelligent, but it was very clever, like many predatory animals. If it wasn't malicious or if it was more intelligent, it could have just revealed it self in the briefing room scene and begged for mercy, I'm sure Kirk and Spock would have accepted it's surrender and fed it all the salt it needed, but no it keep up the subterfuge and then kills it's only supporter, because it thinks it's got a better one, Dr. Crater was as disposable to it as any one. What did it think it would do have it killed everyone but Spock? Not intelligent behavior.
I really enjoyed the scenes with Sulu and Rand. I think they may have been off duty and Sulu was engaging in one of his many interests. Rand was helping out and spending time with him. They only helped out after the alert, but I'm sure they wouldn't stay off duty through an alert. I know things evolve as they go, but I like the way most of the characters get some scenes. Only bad side, no Scotty.