Continuity mistake: Early in the show, Frasier is at home - the rest of the gang have surprised him with a birthday cake. In one shot the candles are burning on the cake, in the next Frasier is cutting the cake and the candles have disappeared, with no time allowed to remove them.
Continuity mistake: At the end of the restaurant scene, where Frasier, Roz, Martin and Roz's mother are eating, Frasier puts his crumpled-up napkin on one side of his plate, but at the end of the scene it has mysteriously switched to the other side without being moved by anyone.
Continuity mistake: Roz and Daphne are standing in front of the elevator talking about the wedding. Daphne is holding Frasier's choice of a bridesmaid's dress. In one shot, Daphne is holding it over her arm, but when she turns toward the door, with no time to change position naturally, she is holding the dress by the hanger.
Continuity mistake: Roz is talking to Frasier, Gil, and Bulldog at KACL and has her hands in front of her, with her mug in her left hand. In the next shot, as she says "everyone at her last station was scared to death of her", her mug is in her hand tucked up under her arm - with no time for her to change positions naturally.
Continuity mistake: When Niles and Daphne are talking at Frasier's door, Daphne says "Now poor Roz really is in that predicament" and her arms are in front of her with her hands clasped. Niles says, "Do I smell chicken?" and immediately her arms are crossed, without enough time for her to change position.
Continuity mistake: Marty, Frasier, Niles, and Daphne are in Frasier's apartment, talking about Marty moving in with Niles - M.'s beer can and remote are sitting on his little table. In one shot they are quite close together, but in the next the can has moved about six inches forward.