When Frasier asks Niles to fill in as host of his radio show, Niles refuses, considering the job beneath him. But Niles has already done and enjoyed it, in Frasier Crane's Day Off (1994).
In a scene during Act 3 of the episode, the coat that Marty throws down during his tantrum moves from the landing stairs to the landing itself.
While at the basketball game, Daphne uses theater analogies to help Niles understand what is going on. She tells him that their seats are "front row orchestra, stage right." Actually, their seats would be stage left.
During Reggie McLemore's (Lorenzo Newton) TV interview, you can see a strip of black electrician's tape over the brand name on Frasier's (Kelsey Grammer) television so that there is no free advertisements on the show.