It is revealed that Eddie (Moose) use to stare at Niles (David Hyde Pierce) before he started doing it to Frasier.
Frasier's (Kelsey Grammer) radio show is established as having premiered on May 21, 1993, which was one day after the finale of Cheers (1982) aired on NBC.
This episode indicates that when Frasier (Kelsey Grammer) first returned to Seattle he retained much of his old Boston self - proudly drinking plain black coffee (and scoffing at Niles' (David Hyde Pierce) coffee order) and having a beer with his father (he typically drank beer at Cheers (1982)). At some point between his return and the first episode of season one (three months later), Frasier's personality changes considerably.
It is revealed that Martin came up with Frasier's signature catchphrase "I'm listening."
The poem Frasier uses to warm up his voice before his first show ("Little owlet in the glen...") is entitled "A Word to the Wise" and was written by Louise M. Laughton. It was first published in the November 1906 issue of "St. Nicholas Illustrated Magazine for Young Folk."