Question: One thing I never got is why Marty is so shocked that the Cubs won the World Series in 2015. He was then going to say something like "It's just that Miami..." but stops and asks another question. Was it ever said anywhere what he was going to say about Miami? That always perplexed me.
Question: In BTTF III, the 1955 Doc is worried about sending Marty back to a "populated area" in 1885, so he insists on using the drive-in, which is way out of town. However, in BTTF II Doc repeatedly travels back and forth from 1985 to 2015 to 1985 in plain view of any number of onlookers. What could've caused Doc to stop caring if people saw his time machine appear and disappear into and out of thin air?
Question: When Marty came back to 1985 in the first movie, some things had changed. The name of the mall for example went from Twin Pines Mall to Lone Pine Mall. How come then when Biff comes back to 2015 after stealing the DeLorean, everything seems the same? Wouldn't they notice everything was different when they were flying over Hill Valley to go back, like Biff's casino perhaps?
Question: Marty prevents the bad 1985 by burning the sports almanac in 1955. However this alone won't prevent Old Biff from taking the almanac from 2015 to 1955. Indeed it raises the possibility that OB will remember having lost the almanac as a young man and choose to travel back to a date other than 12.11.55 to hand it over. I can think of three possible resolutions to this problem: (1) Marty makes a note of the date and time, then burns the almanac as a 47-year-old before Old Biff gets it; (2) Marty informs the 1950s Doc of what is to happen and he resolves to make the DeLorean more secure and/or not to throw the almanac in the bin; (3) Doc travels to 2015 in the steam locomotive and burns the almanac. Any other ideas?
Question: The mechanic tells Biff the price of Biff's car is $300. Does that include the damage Biff caused to the truck he hit if the first film and also the price of the horse manure that had to be hauled away? I know Biff goes into a store across the street for a few seconds so we don't hear part of the argument. Wouldn't Biff have to pay more than $300, or was the $300 just for the car itself?