5. Baloo from TaleSpin probably killed people in World War I
It's easy to forget, what with all the cloud surfing and air pirates and giant bears wearing bomber jackets, but TaleSpin actually takes place in the distant past. Various wikis pin the general date to 1937ish, or around the same time as the first Indiana Jones movie. The timing is smart -- it lets the show focus on badass old-timey planes while still avoiding "Disney animals in World War II" and the anthropomorphic Nazi critters that come with it.
But Baloo's relative age and experience as a pilot means that he probably fought in World War I. He even references a Great War in an episode, looking back on it with a mix of reverence and fear.
Most Disney shows and movies get away with avoiding the horrors of reality by setting the stage in a completely different world, one where kids don't have to be taught about the assassination of Archduke Ferdinand. But by specificially stating that "The Great War ended 20 years ago," Baloo implies that one of the world's most awful and grueling conflicts actually occurred. With talking animals.
Think about it. Cats in pointy helmets. Pandas choking on mustard gas. Hundreds of turtles and frogs vaulting over the trenches only to be instantly ventilated by machine gun fire, their piled bodies forming fleshy sandbag walls that protect the cowards left behind. Baloo survived it all, and probably flew planes that dropped bombs on all sorts of tigers and dogs and probably at least a few fellow bears. He still lives to fly, because it's the only way he can still feel anything.
But that's nothing compared to what'll happen a couple years after the show ends; if there was a World War I, you can definitely bet on a World War II...