Continuity: In the opening scene, Frasier is leaning against the bookcase. There is a shot of Daphne, and after her one line the doorbell rings. The shot then cuts to Frasier who is instantly at the door, although he has not had time to get there.
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Quotes
Frasier: You know the expression "Living well is the best revenge"?
Niles: Wonderful expression. I just don't know how true it is, you don't see it turning up in a lot of opera plots. "Ludwig, maddened by the poisoning of his entire family, wreaked vengeance on Gunther in the third act by living well."
Trivia
Niles and Daphne's baby, David, was named in memory of show producer David Angell, who was killed in a plane during the September 11th attacks. See more...
Frasier (1993) - 1 mistake in "The Unkindest Cut of All"
starring David Hyde Pierce, Jane Leeves, John Mahoney, Kelsey Grammer, Peri Gilpin (add more)
Updates: 
Series 10
The Unkindest Cut of All (season 2, episode 2)
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