Plot hole: When Old Biff goes back to 1955 to give himself the almanac, he comes back in the Delorean to the version of 2015 that he left, not the other, skewed version in which he is rich. Everything in 1955 should have changed around the Doc and Marty, as the Doc tells Marty everything will change around Jennifer and Einstein later on in 1985, when Marty and the Doc go back to restore normalcy. George is alive in this future, so we know the skewed version hasn't taken hold.
Goekhan
11th Feb 2013
Back to the Future Part II (1989)
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Suggested correction: It is established in the movies that the effects of the timeline being changed are not immediate. For example, in the first movie, in the photo of Marty and his siblings, it takes some time for them to vanish from it. When Doc tells Marty everything will change around Jennifer and Einstein when the timeline is restored, I don't think he meant the future will be restored to normalcy right that second, but more after an ample amount of time has passed for everything to be right. After Old Biff gave the almanac to young Biff, there was ample time for him to return to the original 2015 before it changed into the alternate 2015.
That would mean when they restored the timelines it would have taken time for it to adjust again, but it didn't. The new timeline was created but the old one remained because Marty and Doc were still in the original future. However, even though they are not in their original timeline it doesn't make sense for them to still be there, the timeline should have been erased or else old Biff wouldn't be erased either. Again though, a copy of another plot hole, which one is the oldest and original?
9th Oct 2002
Back to the Future Part II (1989)
Corrected entry: This is the part in the very beginning when Doc takes Marty and Jennifer to the future. Wouldn't the future be without Marty and Jennifer because they left in 1985 and must have been missing all that time. From 1985-2015. Thus, there would be no way in heck that they would have existed in 2015, and no way that the 1985 Jennifer would have seen herself or her house, family etc.
Correction: This seems quite a simple point to me, but people keep submitting it. Given the non-linear nature of time, Marty and the others go into the future, but they will eventually go back to the exact moment they left and continue with their lives. Therefore when they see themselves in the future, their future selves have already gone forward, seen themselves, then returned to the past. The only error relating to this situation is that if they've already seen themselves, why are they surprised, as the future selves are the same ones that travel forward in time, but that's a whole different error...
This "they will eventually go back" stuff is making me really mad. I heard it a lot, but it is nonsense! Yes, maybe they will eventually go back (and they do as we know). But we also know that Marty (with the new wisdom of BTTF2) denies to make that car race in the end of the movie and future changes, so his hand will never get destroyed and so this special loser-2015-future they are seeing at the beginning of the movie is definitely not that future they could ever see. They would see a future with a Marty in 2015 with a "good hand" when you assume "they will eventually go back"
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