Continuity: Marty, Elaine, and Frasier are sitting down to breakfast. Elaine picks up her mug and in the next shot we see her reach and pick it up again.
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
At one stage, Niles refers to Frasier's 'Big red clown shoes'. Kelsey Grammer provided the voice for Sideshow Bob in The Simpsons, a clown character who wore such shoes. In fact, in the first episode Kelsey Grammer's voice was used, those shoes were key to the plot. See more...
Frasier (1993) - 1 mistake in "Guess Who's Coming to Breakfast"
starring David Hyde Pierce, Jane Leeves, John Mahoney, Kelsey Grammer, Peri Gilpin (add more)
Updates: 
Series 10
Guess Who's Coming to Breakfast (season 1, episode 13)
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