Continuity: When Niles goes to the sperm bank, in one shot his hands are up on the counter with his fingers laced and in the next shot they are lying flat on the counter.
Great sites
Quotes
Daphne: It makes me glad we don't have so many guns in England.
Frasier: You don't need guns, you have kidney pie.
Trivia
Lisa Kudrow was originally cast to play Roz Doyle but was replaced with Peri Gilpin before filming began. See more...
Frasier (1993) - 3 mistakes in "No Sex Please, We're Skittish"
starring David Hyde Pierce, Jane Leeves, John Mahoney, Kelsey Grammer, Peri Gilpin (add more)
Updates: 
Series 10
No Sex Please, We're Skittish (season 11, episode 1)
Continuity: In the first episode of season 11, "No Sex Please, We're Skittish", Frasier and Roz both say it's been two years since they slept together when it's actually just one.
Continuity: Roz and Frasier are in his apt. after Julia has left. The small pillow on the far left of the couch is quite smooshed down and almost flat, but when Roz walks over toward the center of the couch, the pillow is much fuller and fluffed out. In the next shot we see Frasier sit down on this pillow; when he stands it looks like it did a few shots before - very flat and smooshed.
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