This clip of Michael Keaton doing some stand up, is from a 1977 episode of the talk show Dinah!.
And here he is on a 1978 episode of The Comedy Shop, which was hosted by Norm Crosby. There are some weird edits in this clip. Wonder what was cut.
And from around about the same time, on stage at the Gotham City comedy club.
And here he looks back at those times from a 2017 perspective.