Continuity mistake: Marty gives Niles a mug which says "World's Greatest Psychiatrist." He puts it down on the coffee table with the lettering facing the camera. He then leaves with Daphne and a few shots later, we can see the mug again, but it is turned around and we see the blank side. When Frasier leaves the apartment, it's back in its original position. Nobody ever touched it.
Frasier (1993)
1 mistake in Frasier's Edge
Starring: Kelsey Grammer, David Hyde Pierce, John Mahoney, Jane Leeves, Peri Gilpin
Frasier: And though washing one's hands twenty to thirty times a day would be considered obsessive/compulsive, please bear in mind that your husband is a coroner. Thank you for your call, Jeanine. Roz, whom do we have next?
Trivia: When Nanette tells Frasier she's tired of playing her children's show character, she asks him if he knows what it's like to play the same character for twenty years. By this point, Kelsey Grammer had been playing Frasier for twenty years: eleven on 'Frasier' and nine on 'Cheers'.
More questions & answers from Frasier
Chosen answer: The turkey's stuffing.