Audio problem: In the opening credits Frasier is in Cafe Nervosa with Roz, who is trying to sell him gift wrap. He says, "I'm not crazy about Garfield," and then his lips keep moving even though there is no sound heard.
Continuity mistake: The butler and Frasier are discussing the new president of the opera board and Ferguson pours Marty a cup of coffee. In the next shot, over Marty's shoulder, we see he already has the cup in his hand, although there was no time for this to happen naturally.
Continuity mistake: Roz is at Frasier's soirée joking with Mr. Worth about selling him some giftwrap. Just before she says "everything but my bracelets", her drink and hat switch from her right hand to her left and her canapé from her left to her right. In the next shot they've switched back again.
Continuity mistake: Marty is leaving for the game and Frasier's butler hands him a paper bag with a sandwich in it. Marty carries it in his left hand, but by the time he gets to the door, the bag is folded up much smaller and looks much more crinkled.
Revealing mistake: After Niles tells in front of everyone at the party that he loves Daphne, you see Frasier in one shot standing near the guests by the front door. You can see the set wall ends above the fireplace and a black wall is behind it.
Continuity mistake: When Frasier is hosting his pre-opera party and is greeting his first guests at the door, the female guest has a purse on her arm. In the shot after Frasier excuses himself from them, her arms and purse have changed positions.
Continuity mistake: When Frasier and Niles are in Cafe Nervosa, Frasier is holding section of newspaper in his lap, with an inch or two showing on the table. He and Niles suddenly grab for their cellphones and the newspaper appears fully on top of 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.