I don’t think it was a reasonable expectation back in the 1960s. Most people who watched Star Trek or Captain Video didn’t watch episodes more than once, or possibly twice with reruns, and probably didn’t remember minute details. I don’t think it’s unreasonable to expect continuity for the bigger things.
Talking about minute details, since when were Romulans known to hate all things AI? I pretty much stopped watching all things Trek with Voyager, but was this a thing in the various shows before 2000?
There are going to be errors in it. But the above example is not an error to my mind. The Romulans may very well hate AI, but that doesn’t mean there aren’t Romulan scientist who would jump and a chance to dissect Data. I tend to accept the minor errors because it’s not a big deal and mistakes happen. For Trek, we’re talking about a series of television shows and movies spanning more than fifty years now.
But for some things I expect an explanation if something worked in one episode and doesn’t work in the same way in the next. Let’s take the last Star Wars trilogy that featured a resistance ship attempting to flee from an Order ship through hyperspace. Somehow the Order was always able to track the ship through hyperspace which was something nobody was able to do in previous movies (short of placing a tracking device on the ship as Vader did with the Falcon in the first movie). So how did the Order track them? It’s never explained in the movie. That kind of drove me bonkers though I had many, many other more serious problems with that particular movie.