Continuity mistake: During the opening credits, Frasier and Roz are in Cafe Nervosa talking, and Niles joins them. As they talk, Roz's paper napkin goes from being scrunched up to lying flat, to crumpled, from shot to shot.
Continuity mistake: While Frasier is singing on-stage to Monica, a shot shows Roz from the back, and her left hand is on the table - but in the next shot her hand is stretched out holding her date's hand.
Answer: In the last episode, they explained that Tossed Salad and Scrambled Eggs is a metaphor for the mixed-up people to whom Frasier dispenses his radio psychiatric advice.