Visible crew/equipment: When Frasier and Daphne are sitting talking in the sitting room, Frasier stands and the camera angle shows the fake wall above the fireplace - you can see the flue and that the wall stops just over where the shot normally finishes. There is visibly no proper wall behind the fireplace, you can see clear through to the construction behind.
Frasier Gotta Have It - S5-E19
Continuity mistake: Toward the end of the episode, Frasier and Caitlin are talking at her apartment about their status and she is sitting on the side of his chair. He has his right hand between her knees and left fingers tapping on her left thigh when he says, "well, I have been terribly worried about this global warming situation." Immediately in the next shot when she responds to him, she is holding his left hand with hers, and his right hand is down on the chair.
Continuity mistake: In the scene where Daphne is admiring her faux sapphire earrings, she says that it is the 5-year anniversary of her starting her work at Frasier's apartment. She actually started working in the 1st episode - which was in the fall. This episode takes place in the spring.
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.