Continuity mistake: Frasier and Niles are looking at the salt server Blaine returned to Frasier - in one shot the large envelope, the mailer strip, and the note are on the coffee table - in the next shot the strip has disappeared and the envelope and note have changed position.
Flour Child - S2-E4
Continuity mistake: Frasier and Daphne are forging signatures on the get well card. In one shot they both have their pens quite a distance from the card but in the next shot they are both writing, without enough time for the change. (00:16:35)
Continuity mistake: Tom is sitting on Frasier's couch and has one hand on the arm of the couch and one on his knee. In the next shot he has both hands in front of him. (00:12:15)
Proxy Prexy - S10-E3
Continuity mistake: Frasier is talking about running for the condo board and lifts his coffee cup to his mouth. The shot goes to Martin who says, "You might be the best man for the job," and Frasier's cup is still on the table. (00:01:10)
Martin Does It His Way - S3-E3
Continuity mistake: When Martin is sorting through the box of lyrics, the newspaper on his side table keeps switching position between shots - sometimes it is leaning on top of the remote control, others it is laying flat on the table next to the remote.
Duke's, We Hardly Knew You - S2-E5
Continuity mistake: In the opening scene when Frasier sits on the desk to try and read the information on Roz's side of the glass, the blue book on the desk changes angle between shots.
And the Dish Ran Away with the Spoon (1) - S8-E1
Continuity mistake: Daphne is working on returning her wedding gifts and suspects her brother may have been tampering with them. She crosses her arms and says "Simon" angrily, but in the next shot her hands are holding the sides of a gift box.
Continuity mistake: Near the start of the show, Roz is reading the note Bulldog has left with the teddy bear. She is holding the note in both hands with the bear between her arm and chest. As she says "love, Bulldog", the shot shows one hand hugging the bear against her, with no time for this to have happened naturally.
The Bad Son - S8-E3
Continuity mistake: When Niles and Daphne are on the roof having their picnic, Niles tries Daphne's peanut brittle but when she turns away he throws it off the roof, and lays the plate down on the blanket. When Daphne turns back and asks him what happened to the candy, we see him holding the plate again, even though he had no time to pick it up.
Audio problem: When Frasier and Martin go to see the woman play the piano it's very badly dubbed. Quite often her hands are at totally the wrong end for the sound the instrument is producing.
The Dog That Rocks the Cradle - S7-E5
Continuity mistake: Toward the end of the show, as Roz is talking to Frasier in her apartment, the paper towels behind her in the kitchen change position from one shot to the next.
The Kid (2) - S5-E4
Continuity mistake: Early on in the show Roz and Frasier are in her booth talking, and she is holding a file folder. The next shot from another angle shows her holding a clipboard and then the shot switches back and she is holding the folder again.
Continuity mistake: Frazier and Marty go into the kitchen. Frazier gets out a blue bottle of water, uncaps it, puts the cap on the counter - and in the next shot we see him do the same thing again. He then goes into the living room and mistakenly tells Daphne he is going to pay for her wedding. She hugs him, and he is still holding the bottle of water. The next shot of her hugging him shows nothing in his hands, and when she lets him go, he whirls around and grabs his bottle of water off the bookcase.
Continuity mistake: Bulldog goes into the booth towards the end of the show, and puts his gong and cowbell on the console to his left. When he says "attention, sports fans", the cowbell has suddenly shifted to being in front of him, even though he didn't touch it.
Audio problem: Near the start of the show, Frasier is in the booth at KACL, and has told Roz off and is glaring at her through the glass. As the shot shows her face, however, we can see the reflection of Frasier in the glass - he is smiling and his lips are moving as though he is talking. However, there is no audio to match his speech.
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: At the radio station, Roz waves her pencil at Frasier through the glass to wrap up his show; she has a KACL mug in her other hand. The next shot shows her actually leaning over to pick up the mug, without enough time for her to have put it down in the first place.
Agents in America, Part III - S2-E22
Continuity mistake: When he goes out of the window, Frasier takes off his tie, and there is then a closer shot of him. Suddenly his top shirt button is undone, which it wasn't in the wider shot.
Deliberate mistake: The computer Felicity Huffman pushes off the desk is a dummy model and is not connected to anything. When she first pushes the computer off, the monitor only has a power cable visible. These computers were connected via VGA cable that was screwed on; it is quite difficult to disconnect it from the computer. And also when the monitor hits the ground, you hear light sounds of glass breaking and you can see as the monitor rolls that the glass is missing, yet none is to be seen - it's a hollow chassis. Obviously done as the stuff was shoved off in Kelsey's direction so as to avoid injury.
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.