Continuity mistake: Niles says on Daphne's wedding day that he told her he loved her on his 3 day anniversary, making Daphne's wedding his 4 day anniversary. At Nervosa, Mel says it's their 4 day anniversary, when at this point one more night has passed and it's now 5 days since they married.
Continuity mistake: As Kirby is showing Roz his prom pictures, she sees the picture with his hand on her behind. In the scene her hair on her right changes position in the following shots from on her chest, to slightly behind her shoulder, to completely behind her shoulder.Lummie
Continuity mistake: Frasier is reading the newspaper while Eddie stares at him. He picks up his coffee and we can see he's reading the back page of the newspaper, but from the angle over his shoulder he is reading the front page. It goes back to him reading the back page as he says "you will not distract me" to Eddie.
Continuity mistake: The butler and Frasier are discussing the new president of the opera board and Ferguson pours Marty a cup of coffee. In the next shot, over Marty's shoulder, we see he already has the cup in his hand, although there was no time for this to happen naturally.
Continuity mistake: Roz is at Frasier's soirée joking with Mr. Worth about selling him some giftwrap. Just before she says "everything but my bracelets", her drink and hat switch from her right hand to her left and her canapé from her left to her right. In the next shot they've switched back again.