The tune that Niles whistles as his signals to Eddie during his attempt to take the Daphne Lane street sign is Mozart's Symphony No. 40 in G Minor.
The panel produces a newspaper that says that Frasier tried to commit suicide in Boston (the "Cheers" episode "The Girl in the Plastic Bubble (2)"), and it is dated February 9, 1993. However, the episode aired in November 1992.
Lindsay Crouse (Peg) and John Mahoney (Martin) had worked together the previous year (2001) in the movie Almost Salinas.
This is the last of six episodes featuring Brian Klugman as Kirby.