But the Community actors weren't playing themselves, and Community, sadly, is not really all that well known. It's the rare TV show that's famous enough for the mere presence of the actors on another project to be a comment on that TV show. (Frasier accomplished it when Kelsey Grammer played Sideshow Bob on The Simpsons and David Hyde Pierce came on for an episode to play his brother. That's the only example I can think of.)