The two lazy crows likely are derived from Stepin Fetchit (born Lincoln Theodore Monroe Andrew Perry), whose name originated from his and his vaudeville partner's stage names of "Step" and "Fetchit". (Those names, in turn, had been coined after Perry won money at the racetrack betting on a horse named "Step and Fetch It".) When Perry went solo, he integrated the two names into one and later assumed it professionally.
As was common in cartoons of this era (usually cute ones, BTW), the attention to artistic detail was superb, from the early bird's clever furnishings to the flora depicted in the background.
Cartoon shorts were shown at theaters as part on an entertainment package. As all audiences saw these animated offerings, there was a variety humor, and the occasional sight gag, to appeal to all ages. The baby 'rattle' silly rattlesnake is a good example.
This cartoon is included in the special features of the Warner Home Video DVD After the Thin Man (1936).