Daffy Duck and the Dinosaur
Most of Chuck Jones-directed cartoons from this era (such as the ones featuring Sniffles the Mouse), were very heavily inspired by Walt Disney's cartoon shorts, placing more emphasis on story and animation than on gags. Daffy Duck and the Dinosaur shows the faintest hints of deviation from such cartoons, which would eventually lead to the fast-paced Jones cartoons of the 1940s, such as The Dover Boys and The Draft Horse.
This is also an important milestone in the evolution of Daffy Duck's personality. While Tex Avery and Bob Clampett had depicted Daffy as completely insane, irrational, and uncontrollable in their previous cartoons with the character, Jones depicted Daffy here as somewhat more thoughtful and calculating. Chuck Jones and Friz Freleng would continue to develop Daffy's personality in this direction throughout the 1940s and 1950s.