Continuity: About halfway through the show, Daphne, Roz, Niles, Frasier and Marty are all in the living room. Roz hands Frasier a piece of paper, which he takes and starts to unfold it - in the next shot, he is taking the paper again.
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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
In the opening credits Niles mentions that Daphne had lost 9 lbs. 12 oz at the weight-loss spa. This is probably a deliberate reference to the birth of Janes Leeves' (Daphne) daughter. According to www.imdb.com, she was born in Jan 2001 and weighed 9 lbs. 12 oz. See more...
Frasier (1993) - 1 mistake in "The Botched Language of Cranes"
starring David Hyde Pierce, Jane Leeves, John Mahoney, Kelsey Grammer, Peri Gilpin (add more)
Updates: 
Series 10
The Botched Language of Cranes (season 2, episode 6)
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