Back to the Future

Corrected entry: When Marty goes to see Doc in 1955 we see Einstein as a puppy. This would mean that in 1985 Einstein would be 30 years old. Though not completely impossible (the oldest dog in the world ever was 29) it is highly unlikely.

Correction: The dog in 1955 is a different dog. The Doc even calls it by a different name after another famous scientist, Copernicus.

Craig Bryant

Corrected entry: At the end when George's book is delivered, Lorraine says it is his first novel. If that is the case, what has he been doing for the past 20-30 years to support his family and make them better off than they were at the start?

Correction: His improved self-confidence would have landed him a better job in the meantime. Also, just because it's his first novel doesn't mean he hasn't been writing; he could have published plenty of articles or short stories.


Corrected entry: When the DeLorean is struck by lightning, there is a second stunt person in the passenger seat of the DeLorean. Since they never re-shot this scene, you can see it in all three BTTF movies. (01:36:35)

Correction: No there isn't - that is just the seat and headrest. I have zoomed in and there is just a seat - no person.

Corrected entry: In the scene where George is walking into the cafe to talk to Lorraine, in the background someone asks for a Cherry Coke. In 1955, there was no Cherry Coke.

Correction: Pre-made Cherry Coke did not exist, but 'Cherry Coke' (a Coke with a shot of cherry syrup added) was a common soda-fountain item for many years before Coca Cola introduced the 'official' product. See and

J I Cohen

Corrected entry: We continuously see that the DeLorean travels through time, not space (for example, if you departed in California, you would not arrive in Australia). Putting that, and the fact that Hill Valley is in California, into consideration, if you did use the car to go to the signing of the Declaration of Independence or the birth of Christ, as Doc suggested at the beginning of the movie, you would have to take either a cross-country road trip, or an across-the-globe road trip, the latter of which, I need not tell you, is impossible.

Correction: I know this is marked as a "deliberate" mistake, but actually Doc is using these well-known dates as an example, showing where you *could* go, *if* you were in the right place.


Corrected entry: This is also for the other two.When the doc sends Einstein back in time, you see that it is covered in ice, but in the other time travels there is no ice nor is it the slightest bit cold

Correction: The correction is wrong. Doc did not send Einstein back in time. He sent him to the future. Only then the car gets covered in ice, such as seen at the end of the film when Marty returns to 1985.

Corrected entry: In the scene when the clocks are chiming, Doc says to Marty all of the clocks are 25 minutes slow, but in the opening scene with the clocks, there are two that are set at 8:10 (one on the coffee maker and and a small black clock next to the TV). The rest are set at 7:55.

Correction: Doc probably means all the clocks involved in his experiment, not all the clocks in the house.


Corrected entry: When Doc is attempting to hook the cable to the clock, in 1955, he has on shoes with Velcro. Velcro had not been invented yet.

Correction: Utter nonsense. George de Mestral was granted a worldwide patent for Velcro in Switzerland in 1951, and the US patent followed in January 1952. It was an instant hit and all sorts of Velcro products flew off the shelves, including Velcro shoes.

Corrected entry: At The End of the movie, when Marty and Jennifer are in the DeLorean with Doc, Marty says "You don't have enough road to get up to 88 miles an hour". But only a few hours ago, minutes to the viewer even, after Doc dropped Marty off at home, we see the DeLorean back out of the driveway and speed off, and we hear and see the sound and light of him going into the future down the same stretch of road. Marty is either not good with depth perception or the Doc must've driven through someone's house to get up to 88 miles an hour.

Correction: When Doc Brown goes into the future by himself, we see the DeLorean pull out of the driveway and race down the street, out of view, before it turns around and races past again and vanish into the future. Doc has apparently gone far enough down the street before turning around to give himself enough room to accelerate. After he comes back to pick up Marty and Jennifer, he only pulls out of the driveway rather than driving further down the street as he had before, prompting Marty's comment.

Corrected entry: Anyone else find it ironic that Einstein the dog was the world's first time traveler, while the real Einstein was the one who said that time travel is impossible?

Correction: Part of the "strange" world that Einstein explained in 1905 in his theory of relativity is that time and space are joined in our universe as a four-dimensional fabric known as space-time. Stranger yet is the concept that both space and time warp as mass or speed is increased. Einstein actually proved that time travel was theoretically possible, then spent the rest of his life trying to disprove it.

Corrected entry: When Marty first goes to Doc Brown's house in 1955, Doc mocks Marty's claim that he has come back in time from 1985. When Marty tells him Ronald Reagan is President in 1985, Doc mocks him again and says "I suppose Jane Wyman is First Lady." Ronald Reagan divorced Jane Wyman in the late 1940s and married Nancy Davis in 1952. The fact was well known to anyone who kept track of movie stars so if Doc knew who Reagan was married to the first time, he would know in 1955 that Reagan had been married to Nancy Davis for three years by the time of the scene.

Correction: He's mocking Marty. He is saying that it would be about as believable for Jane Wyman to be first lady with Ronald Reagan as it would be for Ronald Reagan to become president in the first place.


Corrected entry: If Marty had made such an impression on his parents which is how he was supposed to have got his name, surely they would have called their 1st son Marty and not Marty who was their 3rd child? (01:27:20)

Correction: His older brother could have gotten a family name. Which would trump an old friend's name.

Jack's Revenge

Corrected entry: If Marty's family is so much more successful after his trip back in time, why do they still live in the same small house?


Correction: It could be a nice neighborhood. A larger house might have had a high property tax. Just because they moved up in the wealth sector doesn't mean they would have moved far above the upper-middle class level.

Corrected entry: Near the end when Marty gets locked in the trunk he says the keys are there with him. Why would the keys be in the trunk?.

Correction: It was an accident. Similar to locking your keys inside your car. My parents have done this several times with their older cars.


Corrected entry: After Marty gets off the stage after playing "Johnny B Goode" he runs into his future parents. His father thanks him for all his good advice. His mother asks him if they are ever going to see him again. Wouldn't they just assume that Marty will be back in school on Monday? (01:30:20)

Correction: Although I don't think it is ever said, it is made clear throughout the film that Marty (posing as Doc's nephew) is only at the school for a short time, whilst staying with his 'uncle'. The night of the dance is obviously his last night before returning to his normal school.

Corrected entry: In the beginning, Doc and Marty meet at the Twin Pine Mall, and we learn that Doc has built a time machine, which runs on plutonium. He has a heavy case filled with several containers of plutonium, one of which he inserts into the DeLorean. Doc is then killed and Marty flees to 1955. When he goes back to 1985, he plans to get there ten minutes early in order to prevent Doc's death. However, the car runs out of gas and Marty has to run to the Lone Pine Mall on foot, thus getting there too late. He is devastated that Doc is dead. Why? There is more plutonium two feet from him, in the truck. He can just take some, put it in the car, and come back ten minutes early again--or thirty minutes, or an hour, or a day, or whatever he wants.


Correction: True, but this solution probably wouldn't occur to him moments after he saw Doc murdered, so it is conceivable that he would grieve for a while and then hit on the idea if Doc hadn't been wearing body armor.

Corrected entry: Who wrote the song "Johnny B Goode"? It can't have been Chuck Berry, because his cousin Marvin held the telephone up while Marty was playing the song on stage, and Chuck heard it first then. It can't have been Marty either, because he heard the Chuck Berry version of the song while he was growing up. So we have a paradox - nobody ever wrote the song. Whoops - end of the universe time. (01:27:16)

Correction: Not a paradox at all - originally Chuck Berry wrote it and Marty heard it, but in the altered timeline Chuck Berry got his inspiration from Marty. Not a paradox, just a change.

Corrected entry: After Marty returns to the present, he wakes up in his room that is identical to the beginning of the movie, however the rest of the house i.e the living has changed and is more modern.

Waldo Gonzalez

Correction: That merely tells us that Marty was more or less the same in both timelines, having similar tastes.

Which wouldn't happen. Because with loving, successful and self confident parents, there's no way a kid turns up just the same as with goofy, drunk, and pushovers parents.


Unlikely, but not impossible and therefore, not a mistake.


Corrected entry: When Marty first enters Lou's cafe in 1955, Lou is visibly angry at Marty just because he won't order something right away. However, he doesn't seem to care that one of his paying customers, George McFly, is being harassed by Biff and his gang and told never to come in there again. You would think Lou would tell Biff and Co. to knock it off or else be asked to leave.


Correction: George had already paid for his cereal, what does Lou care? Biff and Co. are paying customers on occasion too, he wouldn't want to alienate them either. Especially considering they're likely to vandalize his restaraunt in retaliation.

Phixius Premium member

Corrected entry: Wouldn't Marty's parents and Biff Tannen be amazed and freaked out that their son Marty is identical to Calvin, the kid that played a major part in all their lives, and who they would definitely remember?


Correction: It's 30 years later, I doubt they remember a guy who they only knew for a few days back when they were teenagers well enough to recognise him as Marty.


Besides they don't know about the time machine. To them, it is a coincidence at best.

Continuity mistake: When Biff and his goon friends are in Biff's car, as they chase Marty on his borrowed 'skateboard', the car's rearview mirror repeatedly disappears and reappears, and the side mirror changes from round to square repeatedly. (01:06:50)

Super Grover Premium member

More mistakes in Back to the Future

Marty McFly: Calvin? Why do you keep calling me Calvin?
Lorraine Baines: Well, that is your name, isn't it? Calvin Klein? It's written all over your underwear.

More quotes from Back to the Future

Trivia: The farm where Marty arrives in 1955 belongs to a man called Peabody, and he calls his son Sherman; the names are a tribute to "Sherman and Mr. Peabody," two cartoon time travellers from a 1960s American TV show.

More trivia for Back to the Future

Question: What does the saying "Why don't you make like a tree, and get out of here", mean?

Answer: It's a way of saying "scram" or "get lost." But Biff is so dim, he doesn't realize he's saying it wrong; the expression is "make like a tree and leaf", with the joke being that "leaf" is meant to sound like "leave."

Cubs Fan Premium member

More questions & answers from Back to the Future

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