Visible crew/equipment: Halfway through the episode, the new station manager says she has to fire someone. If you look at the top of the screen by the white box on the wall, you can see the boom mike.
Visible crew/equipment: A boom mic is briefly visible when Frasier is talking with Kate in the hall. (00:11:09)
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.