Hum Along with Herman is a take on the popular TV series Sing Along With Mitch.
Fred and Barney go to the Vic Stoney gym to work out, which is a take on Vic Tanny who was a pioneer of the modern health club, starting the first big gym chain in the 1930s.
Fred crashes through the window of Rocks 5th Ave, which is a play on Saks Fifth Avenue, the American luxury department store chain.
Betty Rubble only appears in the last scene and does not speak.
ABC Originally Broadcast This Episode In Black And White