Continuity mistake: While Marty and Daphne are watching the basketball game on TV, he says "it's completely different", the remote suddenly appears on the table beside him; it wasn't there before and wasn't in his hand. A couple of shots later, when he yells "unbelievable!" it's gone again.
Continuity mistake: When Martin first finds out how Niles cured the basketball player, Niles is getting a drink, and Martin is in his chair. During the shots between them, the remote control on the table next to Martin instantly rotates between angles at least twice.
Continuity mistake: Marty throws his coat on the stairs, but it moves to the landing.
Continuity mistake: When Lilith and Frasier are at Dr. Campbell's (the first time), he makes them tea. A shot shows him preparing it, pouring it, etc. But in the next shot, Frasier and Lilith are already holding their cups. There was not enough time for him to have passed them the cups.
Continuity mistake: Frederick appears in the kitchen to talk to his parents, who are ignoring him. In one shot he is covered with spots and in the next, he only has about half as many. He is supposed to have hives, which I know can appear and disappear quickly, but these look nothing like hives in the first place.
Our Father Whose Art Ain't Heaven - S4-E8
Continuity mistake: Martin and Frasier are in the restaurant and Marty says "you're eating light" as Frasier has his menu up at chest level. The next shot, without enough time for change, shows the menu lowered several inches and held at a different angle.
Dad Loves Sherry, the Boys Just Whine - S4-E9
Continuity mistake: When Sherry brings in the bottle of wine, it's in a paper bag which is twisted around the bottle when she puts it on the coffee table. The next shot shows the bag has been loosened around the bottle and is quite wrinkled. No one touched it in that short time.
Dad Loves Sherry, the Boys Just Whine - S4-E9
Continuity mistake: When Sherry first meets Frasier and Niles, she puts her coat down towards the center of the couch. A few shots later, although no one has moved it, it shifts to the left and her purse, which wasn't visible before, can be seen.
Dad Loves Sherry, the Boys Just Whine - S4-E9
Continuity mistake: In Frasier's apartment, Sherry has just been introduced. Marty has a glass of wine down on the dining room table, next to another one. In the next shot the glass has shifted considerably, but the camera angle has remained the same.
Dad Loves Sherry, the Boys Just Whine - S4-E9
Continuity mistake: Frasier tells his father Maureen wants to break up with him, and Marty heads for the kitchen, leaving his blue container of stomach medicine on the credenza. But as Marty passes by the dining room table, he suddenly has the container in his hand again.
Dad Loves Sherry, the Boys Just Whine - S4-E9
Continuity mistake: When Sherry tells the boys she's a sleepwalker, she has her bag slung over her right shoulder. In the next shot, without time for change, she is holding the bag in her left hand.
Liar! Liar! - S4-E10
Continuity mistake: At the beginning of the show, the KCAL gang are in Frasier's apt. celebrating the SeaBee awards. Bulldog is gloating about his win. At one point he has his left hand out in front of him and up in the air - the next shot the same hand is behind his back.
Liar! Liar! - S4-E10
Continuity mistake: At the beginning of the show, we see Marty add some beer to his champagne glass until it's almost full - just then Bulldog grabs his SeaBee award from the coffee table and now Martin's glass is almost empty, even though he's had no chance to even take a drink.
Three Days of the Condo - S4-E11
Continuity mistake: Frasier and Daphne are talking about the condo board lady leaving pink slips for Marty. There is a pink slip on the credenza which moves several inches towards the couch without either of them moving it.
Continuity mistake: While Marty is reading Daphne's novel to her, his beer can moves from one side of his table to the other, without him touching it.
Continuity mistake: Just after Daphne and Marty leave Frasier's booth, Roz picks up the clipboard from the console to Frasier's right and puts it out of sight; when the doctor comes into the booth the clipboard is suddenly on the console again.
Continuity mistake: Daphne and Martin are at KACL with Roz and Frasier, talking about flu shots. Then Marty starts talking about McGinty's and suddenly there is a clipboard on the console that wasn't there before, and wasn't put there during their conversation.
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.
To Kill a Talking Bird - S4-E14
Visible crew/equipment: After Frasier starts the fireplace and it scares Niles' bird, you can see the hands of a bird handler by the stairs on the upper right of the screen. (00:12:21)
To Kill a Talking Bird - S4-E14
Other mistake: It seems very out of character for Niles, who is so obsessed with cleanliness, to be happy with having a bird flying loose in his kitchen.
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.