We discover that KACL may be part of the NBC radio network when Frasier mis-judges his time to the newsbreak and he talks into the opening of the network news broadcast, and the announcer identifies herself as broadcasing the NBC news.
When Niles is in the kitchen with Daphne, he bumps her and a piece of chicken falls off the platter she is carrying and onto the floor. If you look closely, however, you can see her deftly flick the chicken off the platter with her thumb.
In this episode Frasier says that Paris, France is his favorite city; but in "A Man, A Plan, and a Gal: Julia," he says that his favorite city is Florence, Italy. Of course, since Diane left him at the altar in Florence, Frasier might have been disenchanted with Florence for a while.
Kate: Do you ever jog?
Frasier: Once. In a dark parking lot, when a truck backfired.
Frasier: You see, if you get on that plane tonight you'll regret it. Maybe not today, maybe not tomorrow, but soon and for the rest of our lives.
Frasier is misquoting Rick's goodbye to Ilsa in Casablanca, trying to get Kate to stay in Seattle.