There have been numerous references to Danson's former series
"Cheers" (1982). Cheers co-stars
George Wendt,
Rhea Perlman and
Kelsey Grammer have all appeared on the show: Wendt playing the barman to Danson's character (On "Cheers", Danson played the barman to Wendt's character) and Grammer playing an alcoholic friend of Danson's Harvard-graduate doctor (on "Cheers" and
"Frasier" (1993), Danson played an ex-alcoholic and Grammer played the Harvard-graduate doctor. Rhea Perlman appeared as a therapist with an optimistic view on life, with Danson as the character who's not happy with his life (on "Cheers", Danson plays the cheery character and Perlman's the one who's not happy with her life).
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