Legal Tender Love and Care - S8-E6
Audio problem: This does not sound like a case of Frasier stuttering but it sounds like two sets of the same line over top of each other. When Niles sees Donny come into the restaurant, Abby and Frasier just turn to look and Niles exclaims "I said, don't look." - and Frasier says "you - you did not - not". It's as though they forgot to edit out some sound from two different shots.
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.