The episodes do end with the Paramount logo, although you're right, the copyright doesn't list the studio, just Norway and Filmation.
Paramount was the distributor, so its logo would be there. I'm not sure how that relates to copyrights.
The Terratin Incident" **
For myself I think this story is silly (and, yeah, I know the idea was revisited years later on DS9), but in fairness it isn't badly told as the crew is shown reasoning things out.
DS9 actually handled it a lot more plausibly -- at least, as plausibly as you could handle the idea.
My one question arose after they establish that only organic matter is being reduced...then why isn't the water in the fish tank not shrinking in volume as well?
Water is not organic matter. Organic molecules are those containing carbon. Water is just hydrogen and oxygen.
Also, the idea in "Terratin" was that the spiroid epsilon waves were causing any helical molecules to contract, so living tissues containing DNA were shrunk as a result. Water molecules are not helical.
Of course, the thing that makes this completely ridiculous is that living things are not made exclusively of DNA; it's only found in the chromosomes. So twisting the DNA molecules tighter wouldn't change the size of living cells or bodies; it would just alter the shape of the DNA sufficiently that it could no longer communicate with proteins and enzymes, the cells would stop working, and the affected people would die.
Shrinking people down to a very small size certainly isn't new in science fiction. The most famous examples are the films The Incredible Shrinking Man and Fantastic Voyage as well as television's Land Of The Giants.
Well, technically that last was about normal-sized people on a planet of giants -- at least, that usually seemed to be the case.
TISM's approach was fairly reasonable up to a point; the hero was shrinking because his cells and tissues were sloughing off mass uniformly, and he got gradually smaller over months as he wasted away -- the process accelerating as his total mass got smaller so the amount he lost each day was a larger percentage of the whole. Of course it didn't really make sense because there's no way the bones and organs would've just uniformly shrunk in every dimension and remained functional, not to mention the loss of cognitive function as his brain shrunk; and it got completely fanciful at the end. But it was better than most approaches.
I think it was also done on The Twilight Zone.
They did episodes with giants and tiny people, but I'm not sure they did any with people being shrunk. "Miniature" might technically qualify, but shrinking wasn't the focus of the story.
I guess it just doesn't impress me as something that TOS would have even considered doing. I think it goes without saying that from an f/x point this story would also have been impossible for TOS.
Which was the whole point of doing stories like this. They didn't
want to be within the limits of TOS. Roddenberry and Fontana had chafed against those limits for years; this was their chance to cast them off.