Continuity mistake: Frasier's new friend Bob pulls away from the table in Cafe Nervosa - his plaid hat is still on the chair next to him. In the next shot the hat is suddenly in Bob's lap, even though he couldn't possibly have put it there in that time.
Continuity mistake: Roz is showing Frasier some faxes in his booth at KACL - as she holds them they are folded over. As she says "are you nuts?", the papers are flat in her hand, no longer folded over, with no time for her to have changed them.
Continuity mistake: In the last scene, at the Cafe, Bob puts a dollar on the table in front of him. A waitress brings a cup and puts it down - the dollar has disappeared. In subsequent shots it reappears.
Continuity mistake: Frasier and Bob are in Cafe Nervosa talking. Bob has a book in his hand. In another shot he is moving his hands around, even though there was no time for him to have put the book down.