Question: When Marty and Doc arrive in the bad 1985, they learn that 1985 has changed and are told that alternate versions of themselves exist. Alternate Doc has been committed and alternate Marty is at a boarding school in Switzerland. Nice movie trick to keep them from running into their alternate selves. Question though, isn't the 1985 at the start of this movie also an alternate 1985? This too has been altered from the original 1985 as seen at the beginning of the first movie. So, where are the alternate Marty and Doc in the timeline when Marty's family is actually upper middle class? Since this is an alternate 1985 as well, where is "rich" Marty? Why didn't he bump into his other self, the Marty that owns the black pickup truck?
Question: In Biff's casino Marty is escaping Biff and his goons - he goes into the stairwell and jumps from one stair to another. What I don't understand is how this stairwell works as it seems to be double, with 2 sets of stairs ending up on the same floor parallel to each other, one on one end and one at another but on the same floor. Does this even make sense? Can anyone tell me why a big building would have 2 sets of stairs in 1 stairwell going parallel and end up on the same floors? Any special name for this type of stairwell perhaps? I can't find anything on it.
Question: When BTTF Part II was originally released in theaters, was the trailer for Part III part of the original released film, or was the trailer added in later when it was released on VHS like they did with "The be continued..." when Part I was released on VHS?
Question: Does anyone know why Marty takes a book of matches off of Biff's desk when Biff isn't looking? I know that the matches come in handy at the end of the film when he burns the sports almanac, but what was his original reason for swiping the matches? Unless he knew beforehand that he was going to have to burn the almanac.
Question: In the scene where Marty's recently purchased sports almanac drops out of its plastic bag, Doc says that he did not invent the time machine for financial gain. In Back to the Future's first Twin Pines Mall scene, Doc says that he'll get to see who wins the next 25 World Series. Can we assume Doc would not have tried to profit from knowing those results in advance?
Question: Where are Dave and Linda McFly in the alternate 1985? They don't seem to live with Biff and Lorraine, and they are too old to be packed off to boarding school (like Marty), so where exactly are they? Biff mentions them when threatening Lorraine into staying so its not like they've been rubbed out like George was.
Question: When Old Biff arrives back in 2015, after going to 1955 to give his younger self the almanac, he is in pain due to being shot by Lorraine in the alternate past he created, which causes him in turn to fade from existence in 2015. But once Doc and Marty have changed the timeline back to the original 1985 etc, would Old Biff still exist in 2015, or was his fading from existence permanent when it happened?
Question: Why does Doc suddenly change his ideas (about time travel and not learning too much of your own future) in Part 2? In Part 1, he was determined not to learn too much about his own future, despite Marty trying to warn him that his life depended on it. But in Part 2, suddenly it's okay to bring Marty to the future and give him enough information to try to change the course of destiny for his son. Also, wouldn't it have just been easier to warn Marty about the accident he was going to have that caused his life to go so wrong to begin with? One would have to think that if Marty becomes successful and lives out an entirely different life, then maybe his son doesn't turn into such a wimp.