Question: Why was old Biff seemingly in agony when he returned to 2015 after stealing the almanac? Did this have to do with this not being his future anymore?
Krista
22nd Jan 2005
Back to the Future Part II (1989)
Answer: I saw a behind-the-scenes special about this, and it said the intention was that after giving the book to himself (thereby changing his future) something then happened to Biff after 1985 but before 2015- possibly being killed by Lorraine while they were married. This is why, after changing his past, Biff shouldn't exist in 2015. This incident was never scripted or shot, but that was the idea. Something similar happened to Marty in the first movie. As he faded from existence, he became sick and weak.
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Answer: There is a cut scene of old Biff disappearing after returning the DeLorean.