Continuity mistake: Frasier gets caught in Daphne's Room for the second time and crouches down beside her bed with the quilt over his head. He then sneaks into the bathroom - the quilt is left hanging over the edge of the bed. Shortly afterwards he runs out of the bathroom and the quilt is now folded over, completely on top of the bed, even though no one went near it. (00:13:30)
Continuity mistake: Niles runs to Daphne's Room with a full glass of sherry. He jumps into and out of the room and suddenly the glass is empty, even though he never drank from it, and it wasn't spilled. (00:20:40)
Continuity mistake: Roz, Niles and Frazier are in Cafe Nervosa having coffee. Niles has his hand open against his cup while Roz is making a suggestive remark but in the next shot his hands are laced together on the table.
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.