John Ratzenberger famously played played insufferable would-be-know-it-all bar patron Cliff Clavin on the TV show "Cheers".
He also played Rebel Alliance officer Bren Derlin in The Empire Strikes Back. Given that Cheers aired mostly in the 80's and the waning height of Star Wars mania, it would make sense at some point for Cliff to have said something relating to Star Wars. Much like the TV show "Scrubs" janitor talking about a "dream" he had where he was a cop in the film "The Fugitive" (both played by actor Neil Flynn).
I doubt Cheers would have made such a meta reference, but did Cliff ever say something about Star Wars as a very subtle nod?