I came accross this:
snopes.com: Black Centaur in Fantasia while looking for something else. It seems that Fantasia originally had a stereotypical character of a black female centaur, who's job was to wait on the white ones, but Disney cut her out of the movie in the 1960s. In case anyone thinks this is a hoax, proof can be found here:
YouTube - most racist disney #4 Sunflower the Centaur from Fantasia Nov 16
I can understand why the character was removed, but apparently Disney have been in a state of denial ever since. Here's a far better representation of Sunflower, found on dA:
Fantasia: Sunflower by ~AtomicFireball on deviantART