With the 30th anniversary of the Back to the Future trilogy this year, and several networks showing it, I watched all three for the umpteenth time (and enjoyed every second of them), but wondered about something that happened in BTTF 2.
In 2015, when Biff realizes Doc Brown has invented a time machine, and gets a hold of the Almanac after Doc throws it away in the alley, he takes it, and steals the Delorean while Doc and Marty are getting 1985 Jennifer out of her 2015 house in Hilldale. He then goes back to Nov. 12, 1955 to give himself the Almanac, creating 1985A.
But where did he stash the Delorean while he was there?
Consider where we see 2015 Biff in 1955. We first see him hiding behind a tree in Courthouse Square as 1955 Biff picks up his damaged car, and begins talking to himself. He then drives his 1955 self home and gives him the almanac, leaving 1955 Biff's garage. He then must go back to wherever he's hidden the Delorean, and leave for 2015. Given that 2015 Biff is ~77 years old, uses a cane, and clearly is not the best shape, he could not have hidden it in a distant place.
He can't hide it near Courthouse Square, as there are too many witnesses. He can't hide it near Biff's house (apparently walking distance from Courthouse Square, as both Biff and Marty walked there in the previous scene) because, again, too many witnesses.
Most anywhere else that he might reasonably hide it (the school, Old Man Peabody's Farm, etc.), are too far to walk, and he doesn't have 1955 money to pay a cab driver, since he paid the 2015 cab driver with his thumbprint. He can't have 1955 Biff drive him, otherwise Marty would not have been trapped in the garage until that evening.
We know that in BTTF 2, on Nov. 12, 1955, that there were 4 Deloreans:
(1) the original from Marty's trip in BTTF (at Doc's lab)
(2) the one Doc and Marty bring back to recover the Almanac (behind the Lyon Estates sign)
(3) the one Doc leaves in 1885 for Marty to get home (the Old Delgado Mine), and
(4) the one Biff takes from 2015 to 1955 to give himself the Almanac (location unknown).
Where could Biff have hidden it?
UPDATE (Post-Oct. 21, 2015): I'm not trying to say "I told you so", but even CinemaSins agrees with me on how big of a plot hole this is in BTTF 2. Check out sin #75 from their video (or sin #55 had the Cubs won..... :-/), that mentions this same exact problem. Sorry, I can't help but smile at having posted an SE question about BTTF 2 over 6 weeks before CinemaSins posted about it... :-D