If I understood the TOS situation correctly, or in other words if the people in the comment sections under those videos were correct, the Blu-rays are not source from the ORIGINAL negatives, as the promotional material suggests, but from new internegs created in early 80’s for syndication. That’s why they include unified opening credits (originally each of the first 13 episodes had slightly different opening credits) and fixed some of the effects scenes, like the planet shots in The Naked Time.
This is funny. I’ve seen many Star Trek posts get hijacked and go into a discussion of Star Wars, but rarely the other way around!
I was curious about the Star Trek original series as well. I did some digging and found that there are some audio on the blu-ray set which is not entirely. I was kind of surprised some enterprising (no pun intended) fan had not taken the audio from the laserdiscs and set it to the blu-ray picture or something.
I don’t know exact episodes, but I know some of the opening credits there is dispute about which music played. There is a found effect of a phaser rifle being thrown in “Where No Man Has Gone Before” and one of Spock’s lines in “The Trouble with Tribbles.” There may be others as well, maybe some musical cues were messed with and they added some ship engine noise for the DVD release. Anywhere, I have the set and enjoy it, but there are purists who would love to have the original “night of broadcast” audio and that doesn’t truly seem what was provided. I will end my Trek discussion on this Star Wars thread so as not to run afoul of the moderators. Feel free to PM me to continue the discussion if you feel the urge.