Getting Crap Past the Radar: Implied in "Conrad The Sailor." Conrad takes his eye off his deck-mopping assignment briefly, looks down, scowls and looks slowly up angrily at Daffy Duck, who waves at him from a mast. A pull-back view shows that Daffy merely left dirty footprints on the deck.
Also: "Tick Tock Tuckered" (a remake of the Porky/Gabby vehicle "Porky's Badtime Story") and the puddle on the bed gag.
A subtle piece but you get it if you catch it. "Hollywood Daffy" dresses up as a director in an effort to fool the Joe Besser-esque studio gate cop and make him a star. Daffy asks "What's Errol Flynn got that you haven't got?" He immediately turns to us as and says "Don't answer that!!"