Continuity: When Frasier and Martin are looking at Frank examining the bowl, the cards on the table change position.
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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
Two endings were filmed for the last episode of season seven, one in which Daphne and Niles ended up together and one in which they didn't. It was then up to the audience to decide which version they liked better. See more...
Frasier (1993) - 4 mistakes in "You Can't Tell a Crook by His Cover"
starring David Hyde Pierce, Jane Leeves, John Mahoney, Kelsey Grammer, Peri Gilpin (add more)
Updates: 
Series 10
You Can't Tell a Crook by His Cover (season 1, episode 15)
Continuity: When Frasier and Niles are in the cafe talking about the Topaz Room, the waiter goes from bending over the table to collect the money to upright a few feet from the table instantly.
Continuity: When the doorbell rings Martin leans over to put the cards down, you see him do it twice.
Continuity: When Linda opens her beer, her three piles of poker chips are arranged in a triangle. In the next shot, they are laid out in a line, but she has not moved them.
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