A Word to the Wiseguy - S3-E15
Continuity mistake: While Niles is talking to Martin about Maris's traffic tickets, the coffee pot goes from one side of the Lazy Susan to the other, with no one touching it.
A Word to the Wiseguy - S3-E15
Continuity mistake: Niles goes to KACL and walks into Frasier's booth - there is nothing on the console in front of Frasier - but then in a shot something shaped like a cellphone appears but in subsequent shots is gone again.
A Word to the Wiseguy - S3-E15
Continuity mistake: The guy Niles and Frasier meet at the Cafe puts his coffee cup down twice between shots, after he has made the phone call and before he leaves. (00:09:20)
A Word to the Wiseguy - S3-E15
Continuity mistake: Frasier is on the phone at KACL with Jerome's girlfriend and the reflection in the glass shows him raising his hand to his face, but the next shot returns to him - his hand is on the console. There was no time for him to have shifted positions normally.
A Word to the Wiseguy - S3-E15
Continuity mistake: At the end of their meeting outside Cafe Nervosa, Jerome throws his red paper napkin on the table and they say their goodbyes. In the shot after he walks away there is no sign of the red napkin.
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.