I'll name two for now.
Evil Dead 2: Dead By Dawn (1987) and
Day Of The Dead (1985) have a couple of the most entertaining
Making Of... documentaries.
Day Of The Dead's documentary is actually longer than the movie itself. I normally don't watch stuff like this but I remembered growing up wondering what these people were like in real life versus their on-screen personas, and I was pretty entertained by the both of them. Plus, there were plenty of Easter eggs packed into each, like when Kassie DePaiva (of
Days Of Our Lives,
General Hospital, and
One Life To Live soap opera fame) who played Bobby Joe described being one of the couch cushions laughing at Ash in the scene when he went batsh*t crazy right after the deer head on the wall started laughing at him followed by the rest of the furniture in the cabin.
Or seeing what Joe Pilato looks and acts like nowadays compared to Captain Rhodes in the original
Day Of The Dead (1985) movie:
He reminds me of Michael Shannon in that
Runaways (2010) movie:
I like these special features because aside from the usual special effects sequences of "how did they do that", they get pretty in-depth into the production process behind these two films, which I never realized before how hard it was to get these films done back in the mid-'80s under very limited budgets. I had no idea that
Day Of The Dead (1985) was working on such a shoestring budget because I had thought that George Romero had more clout in Hollywood than he did back then. Romero had a much bigger vision for
Day Of The Dead because it was the third in his "Dead" trilogy and he wanted it to be more epic, but had to settle for less; apparently it was supposed to be more along the lines of
Land Of The Dead (2005) but the studio wasn't going for it.
I love both of these films, and to me they are classic films in my movie library, but watching the special features made me appreciate them even more. Both
Making Of... documentaries clock in at around an hour and a half, so they are feature-length in their own right.