The Arnazes were investors in Frank Loesser's 1956 musical, "The Most Happy Fella," and portions of the original cast album are heard as the Ricardos and the Mertzes are watching the show.
The excerpts from "The Most Happy Fella" in this episode do not match their sequence in the original show. "Standing on the Corner" was originally in the middle of Act I, while Lucy and Ethel hear it as the last number before intermission. "Don't Cry" originally was the last number in Act I, while Ricky and Fred hear it as the first song after the intermission.