Henry Mancini, credited as the voice of Al in this episode, composed the song Moon River, which is played during Frasier's plea to Elaine.
"Moon River" is the song Frasier played in the background of his show during his plea for Elaine to forgive Martin and join him for dinner. "Moon River" is also the melody of the song Frasier sings to close the Seabee Awards in Season 11's "Seabee Jeebies."
Life at KACL: This episode marks the first appearance of Noel Shemsky, who, we learn, works in the sales department, and drives a "73 hatchback," not the moped that is mentioned in a later episode. Roz does go out with him this one time and spends the rest of the series avoiding his love-struck entreaties.
This episode marks the only time in the entire series that Frasier indicates any romantic interest in Daphne. In the final scene when attempting to come up with something to do with themselves while Martin is using the apartment for his date, Daphne suggests that "the answer might be right under our noses". Frasier interprets this to mean that he and Daphne might also spend the evening romantically. He is then crestfallen when it turns out she only meant they should do the laundry.
Frasier: It's ironic, isn't it? My 63-year-old father is about to embark on a night of romance, while the two of us, a man and a woman, both attractive and eligible, in the prime of our lives, have nothing to do on a Saturday night.
Daphne: You know, the answer to our problems might be right under our noses. (looks at him)
Frasier: Yes, Daphne. I think it is. (looks at her)
Daphne: All right, you go claim the washing machines, I'll go get the laundry. (leaves)
Frasier: Now, listen Niles. I'm having a young lady over on Friday night and I was hoping that maybe you could take dad out for me.
Niles: Oh, I wish you'd said Saturday.
Frasier: Why, you have plans Friday?
Niles: No, I have plans Saturday.
Marianne: (calling in) Kids - you can't live with them, you can't shove them back in the womb.
Episode Title: Guess Who's Coming to Breakfast
The title is a reference to the famous 1967 film Guess Who's Coming to Dinner, starring Sidney Poitier, Spencer Tracy and Katherine Hepburn.