Factual error: This episode takes place on Frasier's birthday - Martin had ordered a copy of the newspaper published the day Frasier was born and it is sitting on the dining room table when Daphne glances at it and says "Queen Elizabeth's had another baby." - in the Episode The Late Dr. Crane earlier in the same season, Frasier was mistakenly reported as dead on a local TV news show. The dates for his life were shown on the show as 1952-1999. The Queen, in fact, did not have a baby in 1952.
The Fight Before Christmas - S7-E11
Continuity mistake: Mel and Frasier are talking at the KACL Christmas party - she says "did you two have a good time last night?" and her hands are down in front of her - in the next shot her hand is up at her neck, with no time to have done this naturally.
Other mistake: In the kitchen, when Niles burns his hand you can see him move his hand down to stop the frying pan from falling off the stove. He doesn't touch it again, but it looks like the instinctive actions of someone who knocked something over rather than part of the scene. He just slips out of character for a moment.
Continuity mistake: When Frasier is offering to help Lorna carry her books, her purse switches from her right shoulder to her left arm and back to the right from shot to shot.
Continuity mistake: At Frasier's apartment, Emily asks him if Marty is dating anyone. During the conversation Frasier's hands are in his pockets, and then in front of him, and then back in his pockets, from shot to shot.
Continuity mistake: Marty is on the couch talking to Edward about how he came out, and in several shots his hands are laced together on his stomach. In the succeeding shots, with no time to change, his arms are folded up on his chest.
Continuity mistake: In the beginning scene, Niles and Frasier are arguing by the door. Right after Niles leaves and Frasier yells "Get out! ", the camera pans out and you can see the entire room, at which point Roz is holding her wine glass in her right hand. Immediately after, the camera cuts to Roz who says, "yeah, some nerve..., " and the glass is now on the table in front of her left hand. There wasn't time for her to set it down (especially across her body), and the camera stays focused on her continuously through both shots.
Continuity mistake: In the opera, when Marty waves at the ladies, Fraiser tries to pull his hand down. He looks over at the ladies as he does this, but in the next shot he is turned towards Marty.
Something About Dr. Mary - S7-E16
Audio problem: After Mary says "Except I bet you didn't walk through a metal detector to get to class", Frasier in that shot does not move his mouth in line with the dialog that he speaks, but instead appears to be laughing. Additionally in the next shot, although his mouth now matches his dialog, he is half way out of his seat despite being sat in it in the previous shot. (00:02:15)
Something About Dr. Mary - S7-E16
Continuity mistake: When we first see Daphne's wrist brace it is on her right arm. In the end credits it's now on her left arm.
Something About Dr. Mary - S7-E16
Continuity mistake: Niles is showing Marty how he can kick box and he accidentally kicks Daphne. The tray she is covering flies up in the air, and the snack food ends up on the footstool and the floor. There is also an empty basket in front of the footstool. Niles goes to the kitchen to get ice for her wrist; when he returns most of the snack food and the basket have disappeared.
Whine Club - S7-E17
Continuity mistake: When the gang are at Frasier's apartment for a brunch to get to know Mel, Roz is having a Bloody Mary. In one shot she lifts her glass right to her lips, but in the next shot she is lifting it up to her lips again.
Whine Club - S7-E17
Continuity mistake: During the scene in Frasier's apartment when he's holding a brunch for Mel, Daphne says "it was implied" and suddenly the pitcher of Bloody Marys in front of her has much more in it that it had in the shot before.
Whine Club - S7-E17
Continuity mistake: When Niles and Mel are in his dressing room, Mel puts Niles' jacket on the table in the center. A couple of shots later, the jacket changes position, even though neither of them touched it.
Whine Club - S7-E17
Continuity mistake: During the opening credits, Martin and Claire are sitting in Cafe Nervosa, talking. Claire has her left hand and arm crossed over in front of her but when the shot changes and Marty says "you don't think he was watching", her hand and arm are suddenly extended towards him, without time for this to have happened.
Hot Pursuit - S7-E18
Continuity mistake: Early on in the show, Roz leaves yellow papers neatly on Frasier's coffee table and leaves. In later shots, while the others are talking, we see the papers become scattered - even though no one goes near them.
Hot Pursuit - S7-E18
Continuity mistake: When Kenny comes to Roz's hotel room, Frasier answers the door and his pyjama collar is tucked in under his robe. A couple of shots later it is outside his robe, though he never touched it, and in later shots it is back neatly under his robe.
Hot Pursuit - S7-E18
Continuity mistake: When Frasier and Roz are in the hotel room talking, her champagne glass switches from her right hand to her left hand, from one shot to another, with no time to have happened naturally.
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.