I know a lot of people watched the "Saturday Night Live 40th Year Anniversary" program that aired Sunday on NBC.
I did not watch late-night television in 1975 and so am not familiar with the full range of the program.
Fortunately, I did catch the first broadcast of "Late Night with David Letterman" in 1982, which featured Bill Murray, an early SNL regular. It's got some old references -- Olivia Newton John, anyone? -- but it is still hilarious.