The gag in which Barney points at items on the menu so as not to let the waiter know that he doesn't speak French was created by Don Knotts himself. Years later, he would recreate the bit on an episode of Three's Company (1977).
The music that is playing in the background when Andy and Barney are in the restaurant is Frédéric Chopin's Prelude in E minor, Op. 28, No. 4.
This is the second episode to take place outside of Mayberry.