Revealing mistake: At the end of the episode when Frasier reveals to everyone that Roz is the one who's pregnant, we see Peri Gilpin step into the shot at the top of the stairs too early. She steps back behind the wall and then walks back out again a second later to say her line.
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.