Roz Doyle: Who is it?
Bulldog: It's Bulldog.
Roz Doyle: Shh, pretend we're not here.
Frasier: Roz, you just said "Who is it?"
In the pilot episode, 'The Good Son', there is a fight brewing between Martin and Frasier because Frasier wants to hear Martin actually say the words, "Thank you" to him, for accepting his father into his apartment to care for him. In the series finale, 'Goodnight, Seattle (pt 2)', when Martin hugs Frasier, Martin says, "Thank you, Frasier," to his good son. See more...
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Continuity: At the beginning of the show, while Noel is getting Frasier to sign his Star Trek petition, Roz puts a blue plastic cassette into the machine to Frasier's left. During the scene it changes to a black cassette, without anyone touching it, and at the end of the scene Roz walks off with a blue cassette in her hand.