History YMMV / BackToTheFuture1

** Young Lorraine finally ends her infatuation with the sense that she's kissing her brother. Is it really a sense of her relation with Marty? Or could it simply be the fear of God engendered by Lorraine's unexpected aggressive kissing?

** Marty had already been tardy three times before the scene in the movie.

* StrawmanHasAPoint: Mr. Strickland. Doc Brown is dangerous and a bit of a nutcase.
** He scams terrorists for their stolen plutonium, creating a fake bomb for them.
** He performs risky time-travel experiments.
** He stands in front of a car approaching 90 mph, and drags Marty in front as well. ([[IfMyCalculationsAreCorrect If his calculations were incorrect]], they would have '''been''' in serious shit.)

** Young Lorraine finally ends her infatuation with the sense that she's kissing her brother. Is it really a sense of her relation with Marty? Or could it simply be the fear of God Lorraine's unexpected aggressive kissing generated?

* StrawmanHasAPoint: Barely, since it relies on a coincidence Strickland couldn't have known about. He might be something of a jerkass to Marty at the beginning of the film when claiming he's a slacker who'll never amount to anything, but he is right that Doc Brown is dangerous, in a way - given he's not only willing to perform risky and highly illegal time travel experiments powered by stolen plutonium, but to rip off terrorists for said plutonium who might be out for revenge, and to allow Marty to be dragged into the situation. Based on the future Marty we see in Part II, it could be argued that he was somewhat right about the first part, too. Furthermore, he does have a point in reprimanding Marty for being late four days in a row, since while Marty may have had an excuse on the current day due to Doc's clocks being set back, there's no indication that he has justifications for the other days.

* UnintentionalPeriodPiece:
** People who are too young to meaningfully remember either the UsefulNotes/ColdWar or Gaddafi's UsefulNotes/{{Libya}} will be bewildered as to why it is Libyans who are after Doc Brown since the Cold War ended in the early 90s and Gaddafi's regime collapsed in 2011.
** The lack of technologies like cell phones and computers that were rare in the 1980s but that have become more common since the 21st century. If the movie were made today Marty in the opening scene would be surrounded by computers and would be seen editing his songs on a laptop.
** The [=McFlys=] at the beginning of the movie are depicted [[InformedPoverty as poor losers]]. Millennials who've endured several recessions and a cost of living crisis would see the lifestyle of the original [=McFlys=] as pretty luxurious.
** Doc keeps a portrait of UsefulNotes/ThomasEdison alongside similar portraits of UsefulNotes/AlbertEinstein, Sir UsefulNotes/IsaacNewton, and Creator/BenjaminFranklin (the 1955 Doc addresses his Edison portrait when he's shocked that it takes 1.21 gigawatts to power the flux capacitor). In later years, it became more well-known that many of Edison's "inventions" were actually created by his European immigrant employees (most notably UsefulNotes/NikolaTesla's work on the electric lamp), his sole output in many cases being taking the credit for them, and his generally less-savory behaviors (i.e. patent-trolling in the film industry or his propaganda campaigns against alternating current) became more well-known. While it isn't implausible for the 1955 Doc to idolize Edison, it's doubtful that the 1985 Doc would still do so, at least not without Marty mentioning something about it.
** This all stems from the fact that the film was very deliberately setting itself in 1985, playing up everything that would ground Marty as a teenager from from that specific year. In that vein it was ''kind of'' intentional. We are talking about a time travel movie, after all.

* AluminumChristmasTrees: As Marty tries to tell George to ask Lorraine to the dance, George objects by saying it would mean missing his favorite TV show ''Science Fiction Theatre''. ''Science Fiction Theatre'' was an actual sci-fi show from the 50s, a spiritual predecessor to ''Series/TheOuterLimits1963'' and ''Series/{{The Twilight Zone|1959}}'' (in the extended version of the "Darth Vader" scene, Marty also name-drops those shows).

* OlderThanTheyThink: In the 1950s diner someone is heard ordering a "cherry coke." This sounds like an anachronism to some viewers, who remember that the brand Cherry Coca Cola wasn't introduced until the 1980s. However, the term is much older, referring to regular Coca Cola manually flavored with cherry syrup.

** The Bobs were never thrilled with the effect used to show Marty's hand fading from existence; upon closer examination, rather than the entire hand fading away, it instead appears that a hole is appearing in it.

** Also to modern audiences, the implication that Music/ChuckBerry, one of the pioneering African American musicians, was inspired to write one of his most famous songs by hearing a white kid play it seems problematic. Although Marty only knew it because Chuck Berry played it because he still wrote the song in the timeline Marty came from, so it's really a situation of [[StableTimeLoop Chuck Berry influencing Marty influencing Chuck Berry influencing Marty influencing...]]

** Biff, frequently calling Marty "Butthead", as Creator/JasonHervey is in the movie playing one of Lorraine's younger brothers, and [[Series/TheWonderYears will later use that nickname pretty frequently himself]].

** The fact that the Doc was willing to work with terrorists (albeit to rip them off) is treated ''relatively'' lightly by comparison to how it almost certainly would have been post-9/11 is jarring to a 21st-century audience. Whilst it comes with predictably brutal consequences ([[spoiler:it gets better]]), demonstrating why exactly messing around with terrorists is a bad idea, Marty seems much more shocked that the time machine is nuclear-powered and the Doc had to (illegally) acquire plutonium to power it than the precise details of how.

** Also to modern audiences, the implication that Music/ChuckBerry, one of the pioneering African American musicians, was inspired to write his most famous song by hearing a white kid play it ([[NothingButHits Most famous song in *modern times*]] as Berry was an established, popular musician with a history of hit records years before "Johnny B. Goode" was released) seems problematic. Although Marty only knew it because Chuck Berry played it because he still wrote the song in the timeline Marty came from, so it's really a situation of [[StableTimeLoop Chuck Berry influencing Marty influencing Chuck Berry influencing Marty influencing...]]

* EsotericHappyEnding: Marty returns to the future to find that, as a result of his actions in 1955, his parents and siblings are all more successful than before. This is presented as a happy ending but this means that Marty doesn't remember the events of this timeline and joy parents and siblings are basically strangers to him. Furthermore, the Marty that actually grew up in this timeline has seemingly been erased.

* EsotericHappyEnding: Marty returns to the future to find that his parents and siblings are all more successful than before. This is presented as a happy ending but this means that Marty doesn't remember the events of this timeline and parents and siblings are basically strangers to him. Furthermore, the Marty that actually grew up in this timeline has seemingly been erased.

* EsotericHappyEnding: Marty returns to the future to find that his parents and siblings are all more successful than before. This is presented as a happy ending but this means that Marty doesn't remember the events of this timeline and parents and siblings are basically strangers to him. Furthermore, the Marty that actually grew up in this timeline has been erased.

** For the resemblance to Marty from 1955, his son ends up looking like 1955 Marty exactly 30 ''years'' later, long after he would have remembered the exact facial details of someone he had met for a few hours over the course of a week when he was in high school. While the audience is exposed to only the characters shown on screen in the film, George would have met and/or seen thousands and thousands of people since he was in high school. Finally, while Michael J. Fox and Crispin Glover look nothing alike (because, Doylistically, they're played by different actors), presumably there are some shared facial features visible to the characters that leaves little doubt that Marty looks like his father. In addition, the third film shows that shows that George's great-grandfather and grandfather also looked like Marty, and given that he probably would have seen pictures of them, plus his grandfather would likely have still been alive into George's adulthood, he would more likely notice Marty resembling them than he would "Calvin Klein".