Continuity mistake: Towards the end of the show, Frasier is explaining to Niles how he was stood up that evening; at the same time he is getting himself a glass of sherry. Niles says, "there was no emergency", we see Frasier repeat the actions to get a glass of sherry all over again.
Continuity mistake: Frasier is sitting on the couch watching Wheel of Fortune and eating, with a plate on his stomach. As he talks to Niles he places the plate on the coffee table. Niles says "Are those profiteroles?" and Frasier gobbles them up. Then we see Frasier put the plate on the table again.
Continuity mistake: In the restaurant, Frasier and Ann are at Kenny's table - Kenny puts his napkin down and leaves the table, while Frasier puts his cellphone away. In the next shot, the napkin has changed position on the table and Frasier is putting his cellphone away again.
Continuity mistake: When Frasier and Roz are in the cafe talking about the See Bees, Roz says something like "Those shows are torture." When she does there are many different shots in a short space of time and if you're quick you can see the coffee mug suddenly jump into her hand without picking it up.
Continuity mistake: In the 8th episode of season 11, "Murder Most Maris", Frasier claims to have been "punched in the face yesterday by a man now dead". When he says this, two nights have passed since the murder. The next day Niles panics at the café and then sleeps for 20 hours. This time Frasier claims he was punched in the face three days ago by a man now dead, when by now it has been at least four days.
Continuity mistake: Frasier comes home to find his sherry decanter empty and opens a bottle of wine, which he leaves on the kitchen counter. Niles arrives, wants sherry, and Frasier tells him there is none, saying, "I've opened some wine, help yourself." Niles grabsthe open bottle from the bar area, even though no one had put the bottle back - it should have still been on the kitchen counter.
Continuity mistake: In the doctors office, the doctor wheels Ann out and leaves the X-Ray he just put up of her leg. Later in the scene after Martin and Frasier have their conversation, Ann comes back into the room on crutches. When she does, the X-ray that was on the board has disappeared and never returns through the rest of the scene.