At one point Popeye sings a lullaby that turns into a crazy yodel. Actor William Costello achieved this by alternating his real singing voice with that of the sailor. Such vocal pyrotechnics were Costello's signature as a vaudeville entertainer.
A harp playing depiction of Harpo Marx appears, and apparently meets his demise after Popeye socks him; he's shown with wings and a halo in the next frame.
The famous NBC radio chimes are spoofed at radio station YAP.