Celebrity caricatures are (in order): Ben Bernie (the "announcer" at the beginning), Fred Allen, Eddie Cantor, Rudy Vallee, Portland Hoffa, Bing Crosby, and Joe Penner.
The famous NBC chimes are heard at the beginning of the radio broadcast.
Eddie Cantor sings "Merrily We Roll Along," which would become the Looney Tunes signature theme.
The Bing Crosby-esque crooner would star in his own short, as a singing Rooster who makes the hens swoon, that same year.