Continuity: Roz and Frasier are in Cafe Nervosa near the start of the show and her sunglasses are on the table. However, in a shot over Frasier's shoulder, they are not there anymore. They reappear in the next shot.
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Quotes
[Frasier tries to convince Niles that sleeping with Nanny G is the right thing to do.]
Niles: Did you say something? Your penis was talking so loud I couldn't hear!
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 "Roz and the Schnoz"
starring David Hyde Pierce, Jane Leeves, John Mahoney, Kelsey Grammer, Peri Gilpin (add more)
Updates: 
Series 10
Roz and the Schnoz (season 5, episode 21)
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