Okay, like I'm sure this is has been noticed and mocked by cinema continuity buffs, but I was sitting around daydreaming and out of nowhere it hit me:
When Old Biff left 1955 to return to 2015 after giving Young Biff the sports almanac, how is it that he manages to return to the same 2015 he left? Shouldn't he have been returning to the altered 2015, the one that would have continued from what we saw from the "Biff is King" version of 1985? As soon as Doc and Marty leave 2015, that's the 1985 they go to, because Biff got the book in 1955. That's where Old Biff should have wound up when he left 1955 from the now-altered timeline.
I can't see how I'm not right about this, I'm guessing this is a BTTF nerd-fight issue like we have with Trek.
When Old Biff left 1955 to return to 2015 after giving Young Biff the sports almanac, how is it that he manages to return to the same 2015 he left? Shouldn't he have been returning to the altered 2015, the one that would have continued from what we saw from the "Biff is King" version of 1985? As soon as Doc and Marty leave 2015, that's the 1985 they go to, because Biff got the book in 1955. That's where Old Biff should have wound up when he left 1955 from the now-altered timeline.
I can't see how I'm not right about this, I'm guessing this is a BTTF nerd-fight issue like we have with Trek.