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According to co-writer/producer Bob Gale: We never explained it in the movie. But the history of the characters that Bob Zemeckis and I created is this: For years, Marty was told that Doc Brown was dangerous, a crackpot, a lunatic. So, being a red-blooded American teenage boy, age 13 or 14, he decided to find out just why this guy was so ...

Even if they would notice, they would never accept it as a truth, because it is much against a normal understanding of the world. It would be probably like: "Ever notice how much Marty looks like that one guy I nearly fell in love with?" "Yeah, funny that". And thats it :). They could never imagine/reason, that Marty did time travel. So it is not even a ...

I haven't seen any director commentary, so I can't speak with full authority. However, I don't think they thought that hard about it. I think it is put in there for dramatic effect. The antagonist was defeated, and now instead of the big man on campus, he practically begs from George McFly for work. It is a triumph of the little guy over his oppressor. ...

There is a definitive answer to one part of this question: Is it likely that the producers simply overlooked this? No. It was intentionally removed from the original draft. (Obviously this version is fairly different) Here's the original ending of the script: INSERT – CLIPPING A story with the headline, “Police Quell Near Riot At School Dance,” ...

It's not clear that Biff was trying to rape Loraine. Although he was clearly taking liberties he should not have. McFly subdued Biff in the fight at the dance. After that, Biff learned to take his place behind McFly. The car-waxing scene was really just to prove this. 30 years had passed. The new, wiser McFly was undoubtedly able to forgive ...

Remember that cat your parents took in for one week when you were a child? Isn't it strange that it looks exactly like the kitten you've been raising down to the last stripe? You don't remember what that cat looked like? I don't remember my childhood best friend's face very well and I knew him for years. Had I met him and knew him for a week I doubt I ...

The car had to reach a velocity of 88 miles per hour. It had nothing to do with the speedometer hitting 88 miles per hour. In the animated series episode Gone Fishin` Jules Brown (one of Doc Brown's sons) places a spare flux capacitor in a barrel. When the barrel falls over the waterfall and reaches 88 mph, the flux capacitor activites and moves Jules ...

It doesn't matter His parents never mention the similarity in the movie because: Before the 1955 part of the movie, it would be somewhat of a spoiler. After the 1955 part of the movie, it might have worked, but it would have been "cute dialog of convenience" and not really realistic there. Ultimately, if you accept the underlying premise of Back to the ...

You do have a point on that the fuel could have been syphoned. However, it's more likely that there just wasn't any. When the doc gets back to 1885 with broken time circuits, he first tries to fix it. When he realises it can't be fixed, he buries the car in the mine after first draining it from all fluids. While it is unclear if the car could be dug up, it ...

In all the Back to the Future movies, a major component of the plot is reality taking time to catch up to events. Typically, this is represented as pictures with gradually changing features, which the protagonists are trying to prevent from changing. Marty's family photo in the first movie, and the tombstone in the third are examples of this. From this ...

Speculation: Old Biff returns to the changed 2015 (designated 2015A). Doc and Marty "transitioned" to 2015A without noticing. Why didn't they notice? Maybe because they were out on the street when it happened and Hilldale looks the same in 2015A. BTW, time travelers "transitioning" between changed timelines is implied by Doc Brow when he tells Marty not to ...

Quite simply, it was never fixed. Lightning from an electrical storm struck the lightning rod above the clock tower and travelled down a cable which was wrapped around the metal hands on the clock face at precisely 10:04pm on November 12, 1955. The sudden jolt of electricity damaged the clock mechanism and it has never worked since. The Hill Valley ...

It was 30 years ago for Marty's parents. I can barely remember what happened 30 days ago, I can't imagine remembering something from 30 years prior. Now given that Marty's parents encounter with "Calvin Klein" is what brought them together, I doubt they could remember what he looked like some 30 years later. I would say it's plausible that they would ...

Okay I explained something similar to this over on the Sci-fi/Fantasy area. But this one is actually easier to answer. If the change you made in time affects the future you have to wait for it to catch up to you. An example of this is when Marty saves his dad he alters history but it takes about a week to catch up to his present and erase him from time. Even ...

The fact that old Biff made it back to his own timeline should have been an indication to him that his plans didn't work out in the end. There were effectively two timelines old Biff created when he gave the almanac to his younger self.However, once Marty got the almanac back in the alternate 1985, there was then no longer an alternate 2015. The alternate ...

Have you ever noticed how feminine Biff's character is in the new 1985? The assumption the audience is being invited to make is that, because he was so completely emasculated in his encounter with George McFly the night of the dance, Biff eventually became a homosexual. This explains why George McFly doesn't consider it a risk to keep him around the house ...

Technically, in 1955, Doc Brown didn't invent time travel, he got the idea for the flux capacitor "which makes time travel possible." Doc Brown would first need to actually build a flux capacitor, and then he would need to work out how to use it to build a time machine. Just knowing that something is possible or that it will work, does not tell you how to ...

Who is to say they DIDN'T notice and comment on it... but we didn't see it? What would they have said anyway? Lorraine: "Wow, you look just like a highschool friend of ours. Honey, c'mere! Look at Marty. Doesn't he look like that friend of yours, Kevin?" George: "You mean Calvin? So he does! How weird is that? If he hadn't had disappeared all ...

If the clock had been fixed, it would greatly diminish the significance of the story, as though Marty and Doc's activities had no lasting effect. Of course, a real community with such clock tower would naturally go to some trouble to fix it, probably even replacing the (presumably) melted mechanism. Otherwise such neglect would tend to attract vandalism ...