Continuity mistake: During the closing credits, when Niles goes to Frasier's with some licorice, Marty is lying on the couch, sick. At first his cane handle is facing the fireplace, but when the shot changes, it has moved about 45 degrees towards the window.When he gets off the couch, the handle is facing the fireplace again.
Continuity mistake: Soon after Abbie has arrived at Frasier's, Daphne says to Niles, "It's cute when you do it," and he has his hand on her shoulder. In the next shot, his hands are in his lap and she is taking a sip from her glass, with no time for a natural change.
Continuity mistake: Abbie puts Niles' burning menu in the ice bucket where it remains for the rest of the scene, next to the bottle of champagne. Sometimes the menu is right up against the bottle and sometimes it is an inch or two apart - with no one touching either item.
Continuity mistake: Abby orders Frasier out of her office and she bends down to pick up his jacket from the floor, even though it had been on the chair throughout the scene. She then throws it and his overcoat out the door after him - we see the jacket land on the floor and the overcoat on his head. She slams the door and the shot goes to Frasier - the jacket is now draping his head, rather than the overcoat.
Continuity mistake: Abbie and the gang are in the restaurant for dinner. Frasier has his elbow on the table over his menu and Abbie says, "In front of your father," and the camera angle now shows Frasier holding the menu. After Abbie responds to Marty's lawyer joke, Frasier's hand is back down on top of the menu.
Continuity mistake: When Abbie arrives at Frasier's apartment, she puts her purse on the coffee table; the strap is hanging between the couch and the table. When Frasier offers to walk her to the elevator, she goes to get her purse and it has flipped over with the strap fully visible - even though no one went near it.
Continuity mistake: Niles and Daphne are in the elevator talking about Donny. Daphne has her hands on top of her purse with her fingers laced together. Niles puts his hand over hers but in the next shot his hand is on her wrist and she has her hand against her jacket's lapel.
Continuity mistake: Roz is at Frasier's to tape some CDs, and we see her take some cassettes out of her purse. The shot goes to Frasier and then back to her - the cassettes have disappeared. After he explains that he can't stay, we see Roz open her purse and take out the cassettes again.
Continuity mistake: Frasier, Niles, Daphne, Marty, and Abby are having dinner at a restaurant. Abby has a notepad and cellphone on the table. When Niles announces Donny has just walked in, the next shot shows Abby drinking champagne, but the notepad and cellphone have disappeared.