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96

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 ...


59

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,” ...


53

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. ...


51

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 ...


37

I think that, in the beginning of the film, Doc really doesn't have the letter. Marty's actions in the past changed our present, which is visible by the changes in the characters of Marty's family members and Biff, by the "pines" sign, etc. (image source) There is no reason for the letter to be an exception.


33

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 known him for only a week I ...


31

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 ...


29

You do have a point in 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 realizes it can't be fixed, he buries the car in the mine after first draining it of all fluids. While it is unclear if the car could be dug up, it ...


24

What makes you think the lightning could strike before the clock tower was grounded (by Doc plugging the cables back together, the metal poles beside the road providing a path to ground). Things to note: When the plug near the ground pops loose, the free end is stuck in a tree, not too close to the ground, so not a great path to ground. Lightning is ...


22

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 ...


20

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 ...


20

There's no logic explanation for this, it's just a plot hole created by the need of giving more tension on the end of the movie. Maybe if the horizontal wire could stretch a lot while the car runs after the connection with the hook, but i doubt it.


18

In the original timeline, when the movie starts and Doc tells Marty to meet him at the mall, he doesn't yet know if the experiment will work. Time travel in Back to the Future works by changing history, and at that point, no one had time traveled yet. In the new timeline, shown at the end of the movie, it's unknown whether all of the 1985 events from the ...


17

Suppose the parents did notice the similarity. What would the chances be that they noticed exactly in the '85 time frames the movie shows? Nil.


16

This is all just speculation, but some points to consider: How many bottles of this “petrol” would be required to get to 88 mph? To what degree is this “petrol” compatible with combustion engines from 1985? There were no highways back then, where could you find a place to accelerate to the required speed? (If I remember correctly, flight was not an ...


16

We know that the timer went off several seconds before Marty floored the accelerator. We know that Marty quite literally hooked the line at precisely the correct time. Therefore the only valid conclusion is that Marty accelerated faster than Doc calculated/anticipated/intended. Thus there are only two valid explanations: (1) Doc planned for Marty to ...


15

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 ...


15

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 ...


12

It's a paradox. Predestination Paradox to be precise. The Lightning only strikes the Clock Tower because of the changes Doc and Marty make in order to harness the power of the Lightning Strike. The exact time of the Strike didn't matter, because while Doc and Marty are aiming for that exact minute based on the paper/their "history", whatever they actually do ...


11

I hope I don't spoil the party with an out-of-universe explanation, but I thought that this was really interesting when I found it out: It was just supposed to be funny. The sequels weren't written yet. In the commentary on the DVD, Robert Zemeckis and Bob Gale explain the scene, that it was all just there for fun, including the "To be continued...". At the ...


10

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 ...


10

For an in-universe explanation: There may be sufficient capacitance in the system to allow the lightning charge to be stored for one minute. Doc Brown only knew the the lightning strike to +/- one minute, so it is logical that he would calculate the capacitance of the clock tower, and add additional capacitance to into the circuit to cover one minute of ...


8

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, Marty! 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? Oh yeah, he does! Shame we don't have any photos of him. ...


8

Because that wouldn't make a good movie. In reality they could have burned Kerosene that no doubt has a higher octane rating (150) than petrol of the time. With a low octane rating, they wouldn't have gotten to 88mph because the knock sensors would have cut timing and put the car in limp mode.


8

The ripple effect of 1955 takes weeks in the year 1955. This is because in those weeks there is still a finite probability that the mess can get corrected. (and it does). The photo and Martin that are disappearing are in 1955. Had there been a way to fast forward to 1968, there would be no slow fading ripple effect in 1968 In the same way, the doc sending ...


7

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 ...


7

If Marty & Doc would have dug up the 1885 Delorean, then it wouldn't have been in the cave in 1955. Therefore the Marty in 1885 would possibly cease to exist.


7

No the lightning rod did not stop the freeze of the clock at 22:04:00. The rod just made the lightning go in the flux capacitor. It froze and nobody had a plan to fix the clock. Everybody planned to keep the clock the way it is as if its just a fake clock just for Hill Valleys history and heritage. The lightning went through the flux capacitor after it hit ...



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