Question: When the old Biff gives the Sports Almanac to his younger self, he cautions him that in the future, a teenage kid and an old man claiming to be a scientist will ask him about that book. The old Biff surely knew who they were; why didn't he give his younger self their names, Marty McFly and Doctor Emmet Brown?
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Chosen answer: Old Biff did not count on his young version to be able to remember names. He knew what he was like at that age, and knows that young Biff with his short attention span and hotheaded nature would not be prone to remember much details, so he leaves them out.
Twotall