Continuity mistake: Roz comes back to the restaurant table, after phoning her babysitter, and says, "I have to go". At this point her purse is over her wrist. As she finishes saying, "Alice got a bead up her nose", she is holding the purse by its strap. A few shots later it is over her wrist again, even though she never moved it.
Continuity mistake: When Luke and Frasier are talking in the restaurant, and Frasier asks, "So Luke, you're a boat enthusiast?", his forearm is resting on the table. When the shot cuts back to him, only his hand is resting on the table, with no time for him to change position.
Continuity mistake: Niles is sitting at a table in Cafe Nervosa looking at a magazine - he has a page folded back and we can a large photo on the page. When Roz comes over to use her cell, the shot goes back to Niles and now he has the mag opened at a different page. There's another change when Frasier comes over to use his cellphone. At no time did Niles actually turn a page or even have time to do so.