Hi, I don’t know if this may be of interest but some time ago I did a exhaustive research to understand exactly how many different TOS blooper reels existed, and I assembled one long video with all the existing variations sourced from the best materials I could find (all VHS, including the original “Forty Years of Science Fiction Television Featuring: Star Trek” and “Star Trek 25th Anniversary Special”). The final video lenght was 44 minutes and it included the followings:
Reel 0: excerpt from the “Star Trek 25th Anniversary Special”, better quality. Includes scenes from reels 1-2-3-4.
Reel 1: first part of the first season, probably made for 1966 Christmas holiday’s party.
Reel 2: full first season, includes scenes from reel 1 and the happy birthday video for Roddenberry’s wife Eileen at the end.
Reel 3: second season.
Reel 4: third season, includes scenes from reels 1 and 3.
Reel 5: compilation of reel 1-2-3 with better quality, released on VHS within the documentary “Forty Years of Science Fiction Television Featuring: Star Trek”.
I put it on YouTube (here https://www.youtube.com/watch?v=sd1Fc0u6hoE), but CBS blocked it, despite the low quality, the fact that they have never been released and that there are hundreds of other TOS bloopers reel videos on YouTube (I’m honored CBS chose to block mine).
I did a similar job for all the original NBC promos (also never released offcially) and this time it wasn’t blocked. You can see it here: https://www.youtube.com/watch?v=AbOKvBq2iSk
In the description there is the list of the contents.