Our Father Whose Art Ain't Heaven - S4-E8
Continuity mistake: Martin and Frasier are in the restaurant and Marty says "you're eating light" as Frasier has his menu up at chest level. The next shot, without enough time for change, shows the menu lowered several inches and held at a different angle.
Answer: Nanny G (Nanette Guzman - played by Laurie Metcaf) has been a children's entertainer for twenty years, and tells Frasier, "Do you know what it's like to play the same character for 20 years?!" The joke is that Kelsey Grammer has been playing Frasier Crane since 1984, when the character first appeared on "Cheers", so Kelsey in real life has been doing just that!
Super Grover ★