Corrected entry: When Marty buys the sports almanac, how does he get the money to do it? Considering a Pepsi costs 50 bucks, the almanac probably costs several hundred dollars. How many teens from the 1980's just happened to have that amount of money in their wallet at any given moment? He didn't get the money from Doc since Doc didn't even know he bought it until after the fact.
Kevin l Habershaw
29th Nov 2010
Back to the Future Part II (1989)
Correction: The Store also buys money, so he pays with money from his pocket the novel states this exact thing.
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Correction: He used his thumb. We see Future Biff use his thumb to pay for the taxi.
People who use their thumbs have a recognised fingerprint with an account in which you add money onto. I use my own at school. Since Marty isn't from 2015, he doesn't have one.
But there is a Marty in 2015 with the same thumbprint that would be recognized by the reader, so yes, 1985 Marty could use it.
jimba