It was the 70’s. Variety shows still walked the Earth. Someone even thought reviving the Brady Bunch as a series of musical variety specials was a good idea. Most of these were not taped by fanatical Star Wars fans and endlessly copied and passed around. They were one offs, never shown twice.

If you want a further example of 70’s zaniness, check out the Paul Lynde Halloween Special. It’s on Youtube, features Margaret Hamilton reprising a certain Witch from Oz, and also was the tv debut of a some clean cut musicians who call themselves KISS.
https://www.youtube.com/watch?v=4psTeRpQ-1o