Louise wants a celebrity to talk to the kids at the Help Center, so George suggests Billy Dee Williams, who is in town making a movie. He calls him up, pretending to be author Alex Haley, and asks Ralph to find a lookalike in case he can't get the real thing. Florence is excited at first, but when Ralph returns with the name of a celebrity lookalike agency, she assumes that the man coming to the apartment is an impersonator. Written by
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Florence is made aware of Billy Dee's true identity by opening his wallet and looking at a card presumably his ID. However she then gets excited and jumps up and down waving her arms. This causes the card to fly from the wallet and land on the floor, but the scene proceeds and Billy Dee leaves with non one bothering to pick up much less notice his card on the floor. See more
References Lady Sings the Blues