The Last Time I Saw Maris - S3-E8
Continuity mistake: When Niles is drunk in Frasier's appartment, he puts a six-pack of beer cans on the table by Martin's chair. The pack has changed position on the table later on when Frasier is talking about empowerment, without anyone touching it. (00:09:15 - 00:10:35)
The Last Time I Saw Maris - S3-E8
Continuity mistake: Frasier and Niles are in the living room talking about Maris. Frasier says, "I was on the mark", and Niles' beer stitches from his right hand to his left from one shot to the next.
The Last Time I Saw Maris - S3-E8
Continuity mistake: 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.
The Last Time I Saw Maris - S3-E8
Continuity mistake: Daphne is holding a fire poker when she is having a psychic message. Just after Niles says "Oh dear God", the poker is held straight up. In the next shot, the poker is partially lowered. (00:03:35)
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.