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The creator of “The Simpsons” says Smithers was color incorrect when he first appeared on the show … black.
Waylon Smithers' black hue was simply a mistake, but producers didn't have the money to turn him to his intended yellow … so says Matt Groening.
Groening gives an interesting explanation for the error, which was short-lived. It was corrected for Smithers' second appearance in the town of Springfield … whatever state it's in.
Groening also tells us why all the other characters are yellow … and it's not what you'd expect.