Continuity: Near the start of the show, Roz is in her booth at KACL and takes out her lipstick and compact - we see her uncap the lipstick. Then Niles comes in an Frasier reintroduces them, and we see her uncap the lipstick again.
Great sites
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
Lisa Kudrow was originally cast to play Roz Doyle but was replaced with Peri Gilpin before filming began. See more...
Frasier (1993) - 2 mistakes in "Beloved Infidel"
starring David Hyde Pierce, Jane Leeves, John Mahoney, Kelsey Grammer, Peri Gilpin (add more)
Updates: 
Series 10
Beloved Infidel (season 1, episode 8)
Continuity: Frasier is at the dining room table with Niles looking at Niles's childhood journal. He has his left hand ready to turn a page but in the next shot his hand is on the table, with no time for a natural shift.
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