Continuity mistake: In the opening scene, Frasier is having coffee with Nancy and Roz comes in - she sits down and goes to put her purse on the floor. In the next shot her arms are suddenly up on her table and her hands near her face - without enough time for this to have happened in real time.
Continuity mistake: Frasier gets out his address book to look for women he's dated but we can see the pages are blank even while he reads out names. He is not making them up, as he does phone one named Tatiana later.
Continuity mistake: At the end of the show, when Martin, Niles, and Frasier are leaving Niles's place to go out for ice cream, they leave Maris's opened package on a large footstool next to a decorative metal bowl. When they return (closing credits) with their ice cream the package and its wrappings are gone - even though no one was left behind in the apartment.
How to Bury a Millionaire - S6-E7
Continuity mistake: In the scene where Martin is trying to find some aspirin and appears on the living room mezzanine, John Mahoney is wearing glasses (Martin wasn't wearing glasses at this point). In the next close-up shot the glasses have disappeared. (00:04:40)
How to Bury a Millionaire - S6-E7
Continuity mistake: When Martin is asleep reading a book, from one angle he is holding the book at the bottom and from another angle, at the top.
How to Bury a Millionaire - S6-E7
Continuity mistake: Frasier and Niles are at the Shangri-La, looking at an apartment for Niles. While they are standing in front of the closet, sometimes the door is open (revealing the former tenant's clothes inside) and sometimes it is shut.
How to Bury a Millionaire - S6-E7
Continuity mistake: Near the end of the show, Niles has signed his lease for the Shangra-La with his Noel Coward pen and he puts on the table next to the lease. A couple of shots later we can see the pen lying on top of the lease, even though no one touched it.
How to Bury a Millionaire - S6-E7
Continuity mistake: While Niles is talking to Marty on his phone/intercom at the Montana, the sherry glass on the table changes positions several times.
The Seal Who Came to Dinner - S6-E8
Continuity mistake: Frasier and Niles are in Cafe Nervosa talking about Niles' Dinner Party. During the scene, sometimes the lid of Niles' coffee up is on, and sometimes it is off, even though Niles never touches it. (00:02:35)
The Seal Who Came to Dinner - S6-E8
Continuity mistake: Niles gets out some bills to pay for his coffee and puts all of them on the table, one by one. The next shot shows him counting out his bills in his hand again. (00:02:50)
The Seal Who Came to Dinner - S6-E8
Continuity mistake: Marty begins to wave goodbye to Pam as she and Daphne leave, and as the shot changes, he is suddenly holding a newspaper in one hand, even though he had no time to pick it up. (00:04:50)
Roz, a Loan - S6-E9
Continuity mistake: Frasier and Niles are talking to Marty about the spa. As they speak, the magazines on the coffee table shift about 6 inches even though neither of them touch them.
Roz, a Loan - S6-E9
Continuity mistake: Frasier and Niles are having snacks while they talk about Roz's spending habits. The plate in front of them goes from being full to being half-full in one shot.
Roz, a Loan - S6-E9
Continuity mistake: Roz gives Frasier a gift of a decanter which he takes partially out of the box. By the next shot he has it back in the box and out of sight; with no time for this to happen naturally.
Roz, a Loan - S6-E9
Continuity mistake: In the scene where Niles, Frasier, and Marty are talking about the spa, the spa products on the coffee table in front of Niles and Frasier keep changing position.
Roz, a Loan - S6-E9
Continuity mistake: Martin was holding a little blue bag on Eddie's head to comfort him; when he gets up he tosses it on the coffee table, but when the shot changes it is sitting several inches away from its original spot.
Roz, a Loan - S6-E9
Continuity mistake: While Roz and Frazier are talking in Cafe Nervosa, the whipped cream on top of her coffee changes position and amounts from shot to shot.
Roz, a Loan - S6-E9
Continuity mistake: The bag of beauty products changes, one with a logo and one without.
Merry Christmas, Mrs. Moskowitz - S6-E10
Continuity mistake: The same mistake happens throughout this scene - Helen has her purse on her arm and then on her shoulder and then back to her arm from shot to shot.
Merry Christmas, Mrs. Moskowitz - S6-E10
Continuity mistake: Niles and Marty are in the kitchen and Niles is coaching Marty on how to pretend to be Jewish. While they are talking, the lid on the sugar bowl goes from being on properly to being askew, even though no one touched it.
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.