During his attempt to take the Daphne Lane street sign, Niles (David Hyde Pierce) whistles a tune as a signal to Eddie (Enzo). The tune is Mozart's Symphony No. 40 in G Minor.
The celebrity caller in this episode is Freddie Prinze Jr. (Mike), who calls in while Frasier (Kelsey Grammer) is a guest speaker on the program "Teen Scene."
This is Kirby's last appearance in the series.