Frasier's Imaginary Friend - S5-E1
Continuity mistake: When Frasier is talking to Niles and Martin in the restaurant (when he is supposed to be meeting Kelly) and the level in his wine glass alternates between being half full and almost empty and back again.
Frasier's Imaginary Friend - S5-E1
Continuity mistake: When Frasier gets up to get out of the plane seat between the married couple, he is clutching his coat and boarding pass in his left hand/arm but when he reaches the aisle, they are in his right hand.
Frasier's Imaginary Friend - S5-E1
Continuity mistake: When Marty does his exercises, Eddie watches from the recliner and his bottom is just about in the center of the seat, but as Daphne heads to the door, his posterior is much closer to the arm of the chair, even though he never moved.
Frasier's Imaginary Friend - S5-E1
Continuity mistake: Near the start of the show, Daphne is helping Marty with his exercises and as she goes to answer the door, the towel on his little table changes position noticeably.
Frasier's Imaginary Friend - S5-E1
Continuity mistake: At the beginning of the show, Frasier is on the plane sitting next to a woman who finds out he's only on there because he wants to pursue her. She asks the flight attendant if she could change seats - but the shot before showed that the attendant had completely walked by their seat but when the woman asks her if she can move she has not passed their seat yet.
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.