When Sylvester Jr. wonders where the yellow went (in this case, yellow being cowardice), it's actually a pun on a popular advertising campaign for Pepsodent Toothpaste. "You'll wonder where the yellow went when you brush your teeth with Pepsodent!"
Sylvester and his son are bird stalking in terrain similar to where fellow cast mates Wile E. Coyote and the roadrunner live.
A song that sounds similar to Mel Kaufman's song "Me-ow" plays over the opening credits. This musical parody is also heard in Tree Cornered Tweety (1956), Cat Feud (1958), Goldimouse and the Three Cats (1960), Hyde and Go Tweet (1960) and The Last Hungry Cat (1961).
The first bird the duo glimpse is an ominous looking vulture.