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.
Continuity mistake: Simon has shown up at Daphne's shower and is standing at the bar/table with Roz and Holly. There is a bottle of champagne on the table, next to an ice bucket - but when Daphne drags Simon away the shot shows that the bottle has mysteriously made its way into the ice bucket.
Continuity mistake: Roz is talking about having a fling - while she takes the notebook, which was open on the coffee table, shuts it under its own weight. She keeps talking and waving her hands around, and in the next shot the notebook is open again, even though she didn't touch it.
Revealing mistake: Bebe is in the booth telling Frasier how she misunderstood him about Roz. As she says "wink", we can see Frasier's reflection in the booth's glass - his head bobs up. The next shot we see, though, is of Frasier's head bobbing up - shot at the same time, we just see it a split second later.
Continuity mistake: When Roz is getting ready for the reception at the convention, her wrap is hung neatly over the back of the couch. After she answers the phone and passes it to Frasier, the wrap is suddenly opened up and draped much more messily over the couch. Her purse has also changed position on the coffee table.