Daffy calls Elmer Fudd by his first name several times in this short. He also breaks the fourth wall briefly at the very end of the cartoon and addresses the audience. And the fox sounds like an early incarnation of the dog character, Foghorn Leghorn's nemesis.
Many people believe that Bugs Bunny called Elmer "Nimrod" in several cartoons. However, this cartoon contains the only time Elmer is called "Nimrod", not by Bugs (who is not in this cartoon), but by Daffy.
Daffy entertains the audience by breaking the fourth wall several times. This would become one of his signature moves, just like fellow WB castmates and nemesis, Bugs Bunny. Elmer briefly breaks the fourth wall, too.
The little black duck Daffy refers to (himself) is the American Black Duck, which is similar to the Mallard.
Daffy mentions his employer, Warner Brothers, when he first romances the pseudo female duck.