Question: At the beginning of the movie, as Doc, Marty and Jennifer are leaving in the time machine to go to 2015, Biff sees the DeLorean fly and then disappear. It perplexes him greatly and he even states, "What the hell is going on here?" 1) Why wouldn't Doc have been more careful when he knew that anyone could've walked out of the McFly house and seen the DeLorean? 2) Why didn't it alter things in the future? Sure, Biff may not have told anyone about what he saw, but it's unlikely since he witnessed such a strange event.
Zinka17
13th Jan 2013
Back to the Future Part II (1989)
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Chosen answer: There's no real explanation about why Doc wasn't more careful, but he is an eccentric person who often acts on impulse rather than logic. It also serves the movie's plot for Biff to be there when he was. Biff in 2015 is an old man, and he is obviously somewhat confused about what he saw. He may well have thought it better to say nothing about it for fear he wouldn't be believed and could be accused of hallucinating the event.
raywest ★