Continuity mistake: Sherry is about to tell Frasier and his date a joke - Marty and she have their arms around each other - the first shot shows her large orange purse is over her shoulder (between them) and behind her but the next shot shows it still between them, but in front of her - simply impossible to have changed its position so quickly.
Continuity mistake: During the closing credits, Niles brings a breakfast tray into his dining room and puts it down in front of Marta, who is reading a newspaper. When she puts the paper down, there is a rose lying on the tray - in the previous shot there had been no rose, but there had been several pill bottles there which have mysteriously disappeared.
Continuity mistake: Daphne is on the phone with her mother and has a dust rag in her hand. She holds out the phone towards Frasier and when the shot goes back to her, the rag is all bunched up in her hand - it has been loose before. There was no time for her to change it.
Continuity mistake: At the beginning of the show, Frasier and Niles are in Cafe Nervosa and Roz comes in, with lots of Christmas gifts. She manages to unload them, take off her coat and get into a chair between the guys - all in a couple of seconds. It all happens too quickly for "real time".
Continuity mistake: Frasier's in the toy store and another customer comes in with a carrier bag of educational toys he bought elsewhere. As Frasier tries to talk him into selling him the toys, some shots show just the bag with the toys in it and other shots show a roll of green wrapping paper visible about 6 inches above the bag.
Continuity mistake: At the beginning of the show, Frasier gives Roz an evening purse in a box. She puts it back in the box and as they talk we can see the edge of the box - from one shot to the next we can sometimes see the strap hanging out and sometimes not. The camera angle does not change.
Continuity mistake: Early in the show, at Cafe Nervosa, Roz comes in and Bebe asks her to get her some coffee. Roz returns with a paper bag which she puts down on Bebe's right. In the next shot Bebe stands up with it in her left hand, but there was not enough time for it to change from the right to the left naturally.
Continuity mistake: During the part of the show where they are getting ready to play Murder we can see empty punch glasses on the table - in another shot we see three even though no one went near them. This changes back to 2 after the lights come on - unlikely anyone helped themselves to punch when the lights were out.
Continuity mistake: If you look closely at the couch in the first scene ("A Valentine for Niles") it is not the same couch used during the rest of the run of Frasier - it looks brand new and it doesn't quite have the same texture or look. It makes sense, as Niles sets fire to the couch at the end of the scene.
Continuity mistake: Frasier and Marty are sitting in their living room talking about Frasier's problems with women. Marty has his fork poised above a plate with a slice of cake on it. The next shot shows the fork on the plate, next to the cake. Marty would not have had time to put the fork down in the split-second in between.