In October 1990 ABC aired an interview with a man who, so they believed, had played Buckwheat in the Our Gang series during the 1930s. I have a page about this case of mistaken identity in the hoaxes throughout history gallery:
Buckwheat was the wide-eyed, African-American character played for almost ten years by William Thomas. He was famous for his signature phrase, "O-Tay!" After leaving the show, Thomas dropped from the public eye. 20/20 claimed that it had tracked him down to Tempe, Arizona where he was working at a low-paying job as a grocery bagger. It aired an interview with him in which he talked about the cruel twists and turns his life had taken. Unfortunately for 20/20, the man they interviewed was not William Thomas... The man 20/20 interviewed was an impostor named Bill English who had been claiming to be Buckwheat for the past 30 years.
And I've just now discovered that YouTube has a video from 1990 of A Current Affair interviewing the Buckwheat imposter, after he was exposed. Even though it was clear no one was buying his story any more, the guy still insisted he was Buckwheat. Kind of sad and funny at the same time.