Continuity mistake: While Marty is reading Daphne's novel to her, his beer can moves from one side of his table to the other, without him touching it.
Continuity mistake: Just after Daphne and Marty leave Frasier's booth, Roz picks up the clipboard from the console to Frasier's right and puts it out of sight; when the doctor comes into the booth the clipboard is suddenly on the console again.
Continuity mistake: Daphne and Martin are at KACL with Roz and Frasier, talking about flu shots. Then Marty starts talking about McGinty's and suddenly there is a clipboard on the console that wasn't there before, and wasn't put there during their conversation.
Continuity mistake: When Niles, Frasier, and Roz are in Cafe Nervosa arguing about getting a table, Roz's purse switches from her right shoulder to her left shoulder, even though she did not move it.
Answer: It equals the record of James Arness of "Gunsmoke" for the actor who's played the same part on TV NOT in a soap opera. If you include soaps there are two main contenders - William Roache, who's been playing Ken Barlow in "Coronation Street" in the UK since 1960. Don Hastings has been playing Robert Hughes in US soap "As the World Turns" since 1960 as well.