Good Grief - S6-E1
Continuity mistake: At the picnic, Bulldog puts his hand on the shoulder of a little girl in a dark pink dress, just before the pinata bashing starts; the next shot shows the same little girl is standing on the other side of the pinata, next to a woman in a blue and white striped top.
Good Grief - S6-E1
Continuity mistake: Marty and Niles are getting off the elevator and Marty transfers his mail into his left hand just as he goes to open the door to Frasier's apartment. When the shot changes to show them coming into the apartment, the mail is in Marty's right hand - there is no way he could have transferred the mail again in such a short time.
Good Grief - S6-E1
Continuity mistake: Roz is about to show Frasier her video of him feeding Alice - he is sitting in his dad's chair holding a piece of food in each hand. The shot goes back to him and he has both pieces in his right hand - without enough time for him to switch.
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.