Question: After Marty enters 1885, in his fleeing from the Indians, the DeLorean's fuel line gets ruptured and it loses all its gas. When Marty tells Doc this, Doc says gasoline doesn't even exist yet. However, Doc's DeLorean, which is now hidden in a cave, has its own gas supply in its gas tank and will not need it anymore, as 1955 Doc would just refill it after getting it out of the cave. Why didn't Doc siphon the gas from his DeLorean, and refill Marty's? He said the only problem at that moment was no gas. Not that he could not patch the fuel line, which would have been easy.Scott Miller
Question: At the end of the movie, Jennifer asks Doc about the note she got from the future that became erased when Marty did not participate in the race with Needles. Doc's answer to her question is that her future had not been written yet, and he goes on to say that no-one's future has been, but if that is so, then how come in the previous movies he could travel into the future with Marty to see Marty's future?
Question: When the 1985 Doc is suddenly transported back to 1885 at the end of BTTF 2 and Marty discovers that he has been murdered, because there is a Doc in 1955 that has already been born after the 1985 Doc has died in the West, why did he go to the trouble of going all the way back to 1885 when Doc was still alive? Is there any actual legitimate time travel reason for this, or did he just do it out of instinct to help his close friend?chunkz87
Question: When Marty and Doc are on the train at the end, and Clara shows up, Doc says that Clara will have to go with them to 1985. Why does Doc say that? Someone submitted a correction saying that Clara is better off in 1885 because she was supposed to die so staying in her own period is better than going to the future, so why would Doc suggest such a thing?
Question: In 1955 when Doc and Marty are in the outdoor cinema and Marty is accelerating to 88mph to jump back in time to 1885, doc shouts something to him in celebration as Marty Drives past him, he also fires his gun in the air... Do you know what he shouts? The subtitles just say "shouts something in Spanish" but id love to know what he said and what it means?TDFarthing
Question: For Doc to be so worried about corrupting the timeline in this movie (especially when it comes to falling in love with Clara) he surely doesn't seem to think twice about destroying the locomotive that will no doubt have a huge effect on the timeline. I doubt there were many trains on that railroad, with that mode of transportation now gone, Hill Valley itself could be wiped out.Carl Missouri
Question: Why does everyone say that using parts of the DeLorean that Doc had buried in the abandoned mine could create a time paradox? Firstly, that is never stated in the actual movie. Secondly, if say Marty and Doc use the part on the buried DeLorean to fix the DeLorean that broke due to the explosion caused by the extremely strong alcohol and then again try to run the DeLorean using alcohol that's not so strong, the 1955 Doc would be able to obtain the missing piece of the buried DeLorean. So, technically, there's a plot hole. Why then does everyone say that that's not possible?
Question: Doc Brown shows up at the end of part three with his wife Clara, his two boys, and a time-traveling, hovercraft-converted train. How did he build it? There was nothing in 1885 that could even begin to help him build another time-machine! And don't tell me that he used Marty's 'hoverboard' as parts, because that doesn't wash.CCARNI
Question: When they discover they have no gasoline for the DeLorean, they go through all sorts of trouble to get it up to 88mph. Now it's obvious things fade away and into existence in this movie, as it did with the newspapers and matchbook. Wouldn't it have made more sense to go to the mine where the time machine was buried and write on the wood, "Bring can of gas"? Wouldn't a can of gas then materialize in the trunk of the DeLorean and they could go home?Carl Missouri
Question: Doc is a scientist right? The DeLorean had a ruptured fuel line and needed gas which, as Doc pointed out, was unavailable at the time. Surely he knew how to distill booze to make ethanol? (There was plenty of whiskey around at the time). I mean, they've used it to power cars in Mexico for ages. Why didn't Doc suggest this?Bodragon
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?
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