Appeared six years before Sylvester and Tweety were introduced as adversaries in Tweety Pie (1947). Both the cat and the bird here appear and behave much more realistically, too.
A popular schoolyard dare of the era was to eat saltine crackers and then attempt to whistle. That dare is shown here.
The overhead chase scene, wonderfully animated, shows that the house is furnished with the most up to date accessories, including a bakelite radio and a built in ironing board.