Corrected entry: In the DVD version, if you watch the deleted scenes, it shows old Biff Tannen returning to the future after giving himself the almanac and then being erased from history, probably because Lorraine shot and killed him in 1995. Here is the hugest paradox ever. If Lorraine shot and killed Biff in 1995, then how could Biff grow up to be old Biff and steal the Delorean and give his younger self the almanac in the first place? Also, immediately after old Biff gave his 1955 self the almanac, shouldn't old Biff have immediately been erased from existence while still in the year 1955?
Garlonuss
7th Jul 2004
Back to the Future Part II (1989)
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Correction: It has been firmly established in the BTTF world that, acording to the temporal laws that the film makers have adopted, it takes time for the effect of an action in the past to affect changes in the lives of the ones changing history. That is why Marty didn't disappear the very moment that he stopped his parents from meeting. Theoretically, that is the way that time itself prevents true paradoxes from forming and causing a complete unraveling of spacetime itself by allowing the possibility of correcting the problem.
Garlonuss ★