Many of the signs leading the caveman to the duck are parodies of 1930s-era ad slogans: "Cavemen Choose Duckies 2 to 1" is a parody of a Lucky Strike cigarette slogan, "People Choose Luckies 2 to 1." The Caveman is a parody of comedian Jack Benny.
There are nods here to the yet to be released Fantasia, as well as other early Disney works.
The sign 'For the Pause That Refreshes... Duck' is a knock-off of an early Coca-Cola slogan: 'The Pause That Refreshes'.
'Duck - The Breakfast of Champions' is a play on the Wheaties line (Wheaties - The Breakfast of Champions).