Question: Marty tells Doc that they are out of fuel as the fuel line ripped on the car. Wouldn't it have made more sense for them to uncover the DeLorean that Doc buried, put a piece of paper on the seat with a note saying something like... "Oh Marty, I forgot to mention in my letter that the car needs some extra fuel. Keep a can of gas with you in the car at all times" - Hey presto, Marty would have arrived with extra fuel! Now obviously I hear you shouting "continuity" and "It would be an alternate timeline like in part 2" - But that didn't stop Biff taking the car back to the 2015 Doc and Marty were in, despite Doc later saying if they travelled into the future it would be the rich Biff reality.
Question: Doc gets Marty back home. Then seconds later Marty appears again. He shows Doc the letter he wrote. So Marty goes back to 1885 to save him. They make a big deal of having to repair the DeLorean that was buried in the cave. But why can't they use the DeLorean that Marty just used to get back to 1955?
Continuity mistake: When Marty returns to 1985, he goes to his house and gets in his Toyota pick-up. Look closely behind his head when he first gets in the truck, there is no driver-side head rest. But when he picks up Jennifer, when they pull up to the stop sign the head rest is there. (01:45:00)
Jennifer: Excuse me, Doc Brown. I brought this message back from the future and, well, now it's erased.
Doc: Of course it's erased.
Jennifer: But what does that mean?
Doc: It means your futures haven't been written yet. No one's has. Your future is what ever you make. So make it a good one, the both of you.
Trivia: When filming the scene where Marty is being hanged from the clock tower, Michael J Fox agreed to really hang from the rope. Whilst filming, Fox held the rope away from his throat with his hand. At one time he wasn't holding the rope and was really being strangled. The film crew didn't realise, they just thought it was really good acting, until he passed out.
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