Continuity mistake: The waitress brings Frasier his coffee just as Niles begins to say "Anyway," and she is back behind the counter as he finishes the word. There just wouldn't be enough time in real life to do this. (00:03:55)
Revealing mistake: Towards the end of the episode, as Frasier is on the lounger by the windows, a power cord is on the ground going through the far left window (where glass should be), possibly going to the lamp.
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.