Continuity mistake: Donny is preparing Frasier for court and has a pencil in his hand which goes from eraser side up to lead side up and back again, from shot to shot, without him changing it. (00:08:30)
Continuity mistake: While Frasier is singing on-stage to Monica, a shot shows Roz from the back, and her left hand is on the table - but in the next shot her hand is stretched out holding her date's hand.
Continuity mistake: When Niles is in his office telling Frasier about Shenkman and Maris, a crumpled tissue moves around to different spots on the desk from shot to shot, although no one touches it.
Continuity mistake: When Cassandra and Frazier enter the hotel room, she removes Frasier's coat, and then throws her purse onto her chair and her coat to her right. The next shot shows her heading towards the bathroom carrying her coat.
Continuity mistake: When Niles, Frasier, and Roz are in Cafe Nervosa arguing about getting a table, Roz's purse switches from her right shoulder to her left shoulder, even though she did not move it.
Continuity mistake: At the play run-through in the apartment, Gil is holding his script with a couple of pages folded back. The shot changes and as he says "romping with my school chums", the script is closed with no pages folded back, even though he had no time to change them.
Continuity mistake: Just before Frasier says "What I want is to be left alone", Roz, Niles, Marty, and Daphne are standing at the door. The shot goes to Frasier, and then back to them, and they have all changed positions, with no time to have done this naturally. (00:21:25)
The Show Where Sam Shows Up - S2-E16
Continuity mistake: Near the end of the show, at the end of the scene in Sam's hotel room, Frasier sits down on the couch; his raincoat is over his hands and wrists. The next shot shows his left hand and arm lying on top of his coat.
Continuity mistake: Frasier is having a glass of sherry, sitting on his couch, talking to Niles and Martin. As Marty says "let's go have dinner", Frasier throws his hands up - in real life he would have still had the sherry in his hands. There was no time for him to have put it down.
Continuity mistake: When Niles, Roz, Marty, and Daphne are in the living room confessing something shameful, Martin says, "Every time I watch 'The Sound of Music,' I cry." As the shot changes, we see that his hand goes from his arm rest to his lap and his beer can goes from being on one side of the remote to the other.
Continuity mistake: In the scene where Daphne, Niles, and Frasier are at the table trying to solve the old murder case, the string and paper tag on Daphne's teabag changes sides in her mug.
Continuity mistake: When Frasier is reading from the psychiatric journal that contains Niles' letter, at one point he is holding it in both hands by the front cover - the shot changes and he has one hand on the front cover and one hand on the back cover, without time to switch naturally.
Three Dates and a Breakup (1) - S4-E19
Continuity mistake: Near the start of the show, when the waitress gives Frasier the tickets for the show, she has a dark blue dish towel over her left arm, but as Frasier walks away, it is no longer there.
Continuity mistake: During the breakfast scene Marty's cane is leaning against the table in the same spot, but sometimes there is a bowl of lettuce next to it, and sometimes a bowl of cheese.
Continuity mistake: In the scene where Frasier and Niles are talking in Cafe Nervosa, the position of Niles hands and arms change a couple of times. At one point, while Frasier talks about the young woman he has met, Niles folds his arms in front of him but in the next shot to Frasier, we can see Niles fingers laced together - and then the shot returns to Niles with folded arms. They stay this way until another shot where he says "You were in a mall?" and his hands are suddenly on the table and one is lying over the other.
Dark Side of the Moon - S7-E22
Continuity mistake: When Daphne goes to Niles's place to see him, she sits down on the couch and slides her purse behind her. A couple of shots later Niles gets up and now we can see her purse on the couch to her left. At no time did she make any movements that could explain its change of position.
Continuity mistake: Throughout the Christmas parade we can see that the headphone/microphone is on the left side of Frasier's head. During the first break just after one of the crew members is telling Mary that her improv is really good he tells Frasier to lighten up. Just after he says this you can see that the headphone/microphone is now on the right side of Frasier.
You Can Never Go Home Again - S3-E24
Continuity mistake: Roz has a cassette in her hand as Frasier says "call-screening squelches all that," - and the next shot shows no cassette in her hand, without time for her to get rid of 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.