While it's always been known that TaleSpin was set during the 1930s, in one episode Baloo states that "The Great War ended 20 years ago!" (I heard it was also implied that Baloo was a veteran of the Great War). Not only does that mean TaleSpin was set in 1938, but that World War I, one of the bloodiest conflicts in history, occurred in a world inhabited by anthropomorphic talking animals (those cartoon critters experienced the horrors of war). It also means that World War II was just around the corner. Thus, Baloo's quote adds a dark element to an otherwise lighthearted cartoon.