Continuity mistake: Kelly comes over to Frasier's to read a mock script for the Xmas parade Frasier wants to co-host. She puts her purse next to her on the couch but never opens it. Suddenly reading glasses appear next to the purse, which Kelly subsequently puts on to read.
Continuity mistake: In the episode "Call Me Irresponsible" from season 1, Frasier and Catherine are making out on Martin's old chair, which starts vibrating (probably because they inadvertently hit a switch on the side). But in "Give Him the Chair", Frasier tries to replace Martin's old chair by buying a new one which has a built-in massager. When Martin tries it, he looks horrified and says "That's disgusting", even though his beloved chair had the same feature.
Continuity mistake: When Niles and Frasier are in the cafe discussing how many patients have fallen in love with them, Frasier claims 13. But in the episode "The Maris Counsellor," he states no patient has ever fallen in love with him. OK, time has passed, but he's done hardly any private practice since then, and any he did do was shown anyway.
Boo! (a.k.a. I'm With Her) - S11-E16
Continuity mistake: In the first scene after Niles walks in and takes his coat off. The left-hand side of his shirt collar alternates between tucked underneath his jacket and sitting outside it.
You Can Never Go Home Again - S3-E24
Continuity mistake: When Frasier turns up to the office on his first day, having never met Roz before, he has the briefcase that Roz got for him as mentioned by Roz and Niles 'Fool Me Once, Shame on You, Fool Me Twice...'. How can this be if they've never met before?
Continuity mistake: Marty throws his coat on the stairs, but it moves to the landing.
Continuity mistake: Frasier is opening a bottle in the kitchen while talking to his father. He takes the cap off the same blue bottle twice. (00:05:07)
Goodnight, Seattle (2) - S11-E24
Continuity mistake: When Eddie eats the wedding ring at Martin's wedding, there's no food on his plate, next shot there is.
Continuity mistake: After Martin lowers his chair and gets the bag of pretzels it cuts back to Frasier and you can see the bag still on the coffee table. Then it cuts back to Martin and he has the bag. (00:06:16)
Continuity mistake: When Frasier is asking Noel for a favor, Frasier sets papers down on the desk which move from place to place and even disappear and then reappear between camera shots.
Morning Becomes Entertainment - S7-E19
Continuity mistake: Bebe places her purse behind the couch when she sits down to start the show. It appears and disappears throughout her scene with Frasier.
Continuity mistake: After Frasier puts his cherry glass on the table, the amount in the glass changes several times before he picks it up again. (00:09:50)
Continuity mistake: Kenny enters the booth, and Dr. Nora's purse is on the edge of the desk. Immediately in the next shot it's gone. Then it's back. When Kenny leaves it's gone again. (00:10:25)
The Friend - S3-E11
Continuity mistake: While leaving Nervosa, Bob has the BBQ book in his lap. After Frasier leaves, the book is back on the table. (00:12:10)
Continuity mistake: Frasier is handed a beer with an inch or two of froth. When the shot changes the froth has all but disappeared. (00:15:30)
Continuity mistake: Toward the end of the episode when Poppy is airing her first "arts in Seattle" show, Frasier, Kenny, and Gil convene in the hall outside Frasier's booth to talk. Right after Gil speaks during Frasier's monologue beginning with "I assure you, she is way over her depth here...", viewers can see Poppy through the window sitting at the booth with her mouth closed, looking around (and even up at the ceiling), appearing to be waiting. A split second later, the camera cuts to Poppy in mid-sentence during her live broadcast.
Frasier Gotta Have It - S5-E19
Continuity mistake: Toward the end of the episode, Frasier and Caitlin are talking at her apartment about their status and she is sitting on the side of his chair. He has his right hand between her knees and left fingers tapping on her left thigh when he says, "well, I have been terribly worried about this global warming situation." Immediately in the next shot when she responds to him, she is holding his left hand with hers, and his right hand is down on the chair.
A Man, a Plan and a Gal: Julia - S11-E2
Continuity mistake: When Frasier is playing pictionary, his drawing of Jerry Garcia changes noticeably within shots without him touching it.
Continuity mistake: Martin opens the jewel case-like box twice in two different shots in the background. (00:09:55)
Continuity mistake: In the scene where Daphne is admiring her faux sapphire earrings, she says that it is the 5-year anniversary of her starting her work at Frasier's apartment. She actually started working in the 1st episode - which was in the fall. This episode takes place in the spring.
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.