In the scene where Foxy was trying to push a hippo into the streetcar, which is clearly too small for her, she starts mumbling in gibberish. It's actually a backwards track and when played in reverse, she's clearly saying "Susie heard one of those Atlantic bells! Whataya think?"
The hobos dinner cooking under the railroad tracks pokes fun at Herbert Hoover's supposed promise of "a chicken in every pot"
The advertising signs inside the trolley are parodies of Arrow Collars, Old Dutch Cleanser, Smith Brothers Cough Drops, Fisk Tires, and Packard Automobiles.
The song "Smile, Darn Ya, Smile" would later be used on 1988 Touchstone film 'Who Framed Roger Rabbit'