The characters were parodies on Frank Sinatra (the skinny kid from Hoboken) and Bing Crosby. Both were hugely popular radio stars of the era.
The Sinatra canary uses "Foamo Seltzer" on the cat, a parody of Bromo-Seltzer, a popular antacid powder that fizzed when added to water.
Vitamins and their uses were an important postwar development in health care, though still an object of distrust and humor by some of the population. That is shown here.
The Crosby-esque parrot is shown reading a horse racing publication, a nod to the real Bing Crosby's fondness for the sport of kings.
An adult cinema audience (cartoon shorts were still a part of a full movie show experience) would have appreciated the humor as well as the carefully detailed depictions of the emerging postwar suburban home and auto culture.