The Last Time I Saw Maris - S3-E8
Continuity mistake: When Niles is drunk in Frasier's appartment, he puts a six-pack of beer cans on the table by Martin's chair. The pack has changed position on the table later on when Frasier is talking about empowerment, without anyone touching it. (00:09:15 - 00:10:35)
Three Faces of Frasier - S7-E21
Continuity mistake: During the opening credits, Frasier, Martin, and Daphne are sitting at the table talking about getting older. At one point Martin says "when people reach our stage in life" and his left hand is holding his coffee cup. But as the camera cuts to Frasier we can see Martin's hand in the left corner of the screen, up in the air, without the cup. The next shot shows it back on the table, holding the cup again. All this happens too quickly for the changes in real time.
Legal Tender Love and Care - S8-E6
Continuity mistake: During the closing credits, when Niles goes to Frasier's with some licorice, Marty is lying on the couch, sick. At first his cane handle is facing the fireplace, but when the shot changes, it has moved about 45 degrees towards the window. When he gets off the couch, the handle is facing the fireplace again.
Legal Tender Love and Care - S8-E6
Continuity mistake: Soon after Abbie has arrived at Frasier's, Daphne says to Niles, "It's cute when you do it," and he has his hand on her shoulder. In the next shot, his hands are in his lap and she is taking a sip from her glass, with no time for a natural change.
Continuity mistake: A fan next to Niles is holding his nachos container by its side as they talk. In the shot where he gets up to leave, his hand is under the container, with no time for this to have happened naturally.
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: Just before Marty says "Quack" to Daphne, his hands are in his lap. The next shot shows them on the arms of his chair. (00:05:40)
Continuity mistake: When Frasier's date calls and cancels, we can see his overcoat covering the back of the couch, but in the next shot, as he says "fat chance", the coat has changed position and we can see several inches of the top of the couch.
Continuity mistake: During the closing credits, while Bulldog is in his booth, his horn changes position on the console by rotating 180 degrees.
Docu.Drama - S8-E16
Continuity mistake: When Frasier is in the conference room with Roz, his binder changes from shot to shot. Sometimes there are 4 brightly coloured tabs at the top, sometimes only 2. The same shots show a change in the papers on the table too.
Match Game - S11-E18
Continuity mistake: While Niles, Daphne and Marty are watching the video of Cindy's labour, the bag of Marty's cookies change position a few times - from being in his chair to being on his little table, and back again.
Continuity mistake: Roz is at Cafe Nervosa, sitting with Marty, pretending to be his date. In one shot her hand is covering his, in the next shot her hands are in her lap - but in the next shot, her hand is back covering Marty's.
A Man, a Plan and a Gal: Julia - S11-E2
Continuity mistake: While Julia is eating dinner at Frasier's and talking - her cellphone changes position next to her plate several times - without her ever touching it.
Miracle on Third or Fourth Street - S1-E12
Continuity mistake: When Roz and Frasier are exchanging gifts, when Frasier first puts the lid back on the gift box there is no tissue paper sticking out. In the next shot, a large sheet of red tissue paper is outside the box.
Factual error: There are many factors concerning Niles' post-operative state which are very inaccurate. After open heart surgery it takes at least three months for the chest bone to heal, Niles would not be able to drive a car for weeks, nor would he be able to lift or twist which he does on the show. Also, he doesn't sport a scar. Your chest bone begins very high up, just below your neck, his scar should have been visible on numerous occasions.
Suggested correction: He has a scar in season 11 episode 8. When he's naked in the cafe. A scar just like my dads from heart surgery.
While this mistake points out many different factors, I don't think this should qualify as a valid correction. The mistake is saying in season 10 he doesn't have a visible scar when he should and the correction points to seeing a scar a third of the way into season 11.
The Great Crane Robbery - S8-E4
Continuity mistake: At the beginning of the show, Roz goes into Frasier's booth and starts to put her pencil on the console - but in the next shot, as Kenny comes in, she is reaching for papers and the pencil is nowhere in sight.
The Bad Son - S8-E3
Continuity mistake: When Daphne and Niles are on the roof having their picnic, the basket behind them is opened from the center and on the inside on the left are two champagne glasses. A couple of shots later and the glasses are now on the right side, even though no one touched the basket.
Continuity mistake: Frasier and Niles are in Cafe Nervosa - we see Frasier put his coffee down but as Niles says "Spanish leather", we can see Frasier's cup up in the air again on the right - with no time for the change.
A Man, a Plan and a Gal: Julia - S11-E2
Continuity mistake: When Frasier says "shame on you," Marty has his table napkin over his hand, but a split second later the shot shows his hand under the napkin, without enough time for the change.