"The Muppets on Puppets" was one program in a series called "Adventure in the Arts" (I believe... I may be wrong on the overall title). I'm not sure about years, but I can definitely tell you that the B&W version WAS rebroadcast after 1970. I worked at a Public Television network from 1971 - 1975 and that is where I first saw it. That is also where I saw the remake in color.
That's weird. I wonder if it was in both color and black and white around the same time or in different years. I wonder if most of the dialogue was the same, as well as all of the characters who appeared. And I wonder how many of us knew about this until now (I haven't read any such info at Mupet Wiki).
I was wondering if Disney owned the rights to this special or if another company did. If it was broadcast as part of an anthology series, then I guess it's owned by whoever owns that series, but at least Disney is able to release it on DVD regardless of who owns the distribution rights to the special (I guess Disney worked out a deal to release this special). And now that I know that I'll be seeing this in a few months and know that there were two versions, then it makes me want to see both versions!
If Disney doesn't own the special, then I'm still not surprised that Disney can release it. I was just as surprised that the Weezer videow as included in the secodn season set, and didn't think that Disney owned that music video.