Directed by:
Robert Zemeckis

Starring:
Michael J. Fox as Marty McFly
Christopher Lloyd as Dr. Emmett Brown
Lea Thompson as Lorraine Baines
Crispin Glover as George McFly
Thomas F. Wilson as Biff Tannen
Claudia Wells as Jennifer Parker
Marc McClure as Dave McFly
Wendie Jo Sperber as Linda McFly
George DiCenzo as Sam Baines
Lee McCain as Stella Baines

• When Doc Brown is about to make his turning to the hill valley (in the future) he says "here's our exit" and turns the steering wheel to the left, but when the camera shows the car it moves to the right. - [S]isq[o]

• Near the end of the movie when Marty and Biff are in the tunnel, at one point Biff gains a rear view mirror. - corndog

• In the scene where old Biff goes back to give his younger self the almanac, we see young Biff picking up his car from the garage after repairs. The tow truck sitting just ahead of Biff's car has taillights from an early 70's Chevrolet van on it, yet the scene is set in 1955. - Al
  

• (Plot holes) When Marty and the doc return to the alternate 1985 they are unaware of the changes at first but they should know what the present is like because Biff received the sports book in 1955 and so Marty would have been born into the alternate reality and doc would have witnessed things change. And also everybody else in that reality cant understand why Marty doesn't seem to remember why things are the way they are indicating that Marty was fully aware of them growing up. - spike

• (Factual errors) Biff is obviously the same age as Marty coz they were in the same year at high school (went to dance etc)but how come 30 years into the future marty is 47 so should biff be...but he is a Grandpa with a cane and obviously much much older! - chardman

• (Plot holes) There seems to be a big debate in whether it was possible for Marty and Jennifer to see their future selves in the future. The explanation is that hey return back to 1985 and finish their time lines. But, there is still an error in that their future couldn't have occurred that way because at the end of BTTF3, Marty avoids the accident with the rolls royce that ruins their lives in the future. - Franky

• (Plot holes) In BTTF2, Old Biff goes back to 1955 to give young Biff the Almanac. But then it shows Old Biff going back to original 2015 and he should have been going back alternate 2015. Which would make the time machine never get back to Doc and Marty in original 2015, and they would have just disappeared in the regular 2015 along with everything else. - tom

Commented Goofs

• In "Back to the Future 1" Marty can only travel in time if the DeLorean is struck by lightening AND is traveling 88mph at the same time. But in part 2 the car travels back to the old west after being hit by lightening only. It is not traveling fast but merely hovering in a storm. - Dave
  • Comment: Dave it doesn't have to be going 88 miles an hour Doc explains in Back to the Future 3 when he states the the lightning activated the time circuits (which is false he bumped the circuits but he didn't know so to him it makes sense). The 1.21 jigawatts activated the flux capacitor and sent him back. - ash
    • Correction: Actually in Back to the Future III, the Doc states that the lightning spun the wheels up to the speed of 88 miles per hour, hence the DeLorean being sent back in time when it was struck. There are two elements required for a time jump-- a speed of 88 mph and enough power to activate the flux capacitor. In this case, the lightning accomplished both of those things, since the DeLorean was flying and the wheels, because they were not grounded, were spun by the lightning. This also explains the pair of flame trails that look like backwards "9's," that appear in the sky right after the time jump. - BenBigwig
  
  

Corrected Goofs

• (Revealing mistakes) In the scene where Griff and his bunch are chasing Marty on the hoverboards, and crash into the clock tower...as they're flying up into the air toward the glass, anyone can see they're being lifted up, not by gravity. - JP
  • Correction: This is not a mistake. There is a quick cut of the gang's hoverboards activating in midair, so what happened is that the gang was dragged through the air by their hoverboards. They were not supposed to just be "falling." - BenBigwig

Explained Goofs

• In back to the future part II, Marty goes into the future to see himself--but this is paradoxical. He leaves the timeline in 1985, and so, to the rest of us without time machines, Marty has disappeared. Therefore, when he arrives in 2015, he shouldn't be there--should he? He disappeared 30 years ago, a la close encounters of the third kind. While it is possible to back in time to see yourself, it is theoretically impossible to go forward in time to see yourself. - albanyhog
  • Explanation: Marty going into the future isn't paradoxical, since he returns to 1985. He still finishes his timeline into the future. If he didn't return to 1985, it would become a paradox. Just one school of thought on time travel. - Big B

• OLD Biff Tannen goes back in time to give his past self a book on future sports scores. This changes Marty's present, so that when he returns from his future he ends up in a place where his Mum married Biff, his dad died, etc. Now Doc explains that they can't go to The Future as their timeline has already changed, and they'd go into this alternative 1985's future. In that case how did Old Biff end up back in normal 1985's future? We see him return Doc's DeLorean and stagger away from it, breathing hard. If he had given Young Biff that book he should have traveled into an alternative future, not this original one! - Jagannatha
  • Correction: This is a possible correction to the argument as to how Marty and Doc can remain in the real 2015 even after Biff ha went and gave himself the magazine and changed the course of time. Marty and Doc would remain in the real 2015 because they have already fixed the problem in the past. When they return to the alternate 1985 and realize the problem they leave for 1955. At the point they leave 1985 to go to 1955 time from the point they leave and forward is instantaneously returned to normal because in 1985 they have already corrected time 30 years earlier. Thus when they were leaving 2015 time has already been corrected 30 years earlier. The only thing this doesn't explain is why Biff was in pain when he got out of the DeLorean. - David
    • Explanation: The reason that Old Biff staggers away was explained by either Zemeckis or Gale in an interview (I forget which), Biff staggers because he has been erased from the new 2015 , which answers the first posters question, it's not the original 2015, it's the new one. Gale or Zemeckis said that they originally showed Biff fading away but that test audiences didn't understand so they had to cut it. He also stated that it's possible everything else around them changed but we just don't see it. For instance, Mart and Jen almost certainly don't live in that house anymore. He also said that in his mind Lorraine killed Biff sometime in the 90's. Interesting. So again, Biffs staggering and fading proves that it is the alternate 2015 that Marty and Doc have to fix. (VHS) - zombie1090
      • Comment: zombie is right. If you have the dvd, check out the deleted scenes and it has old Biff vanishing from 2015. - Edd

• After Marty returns to 1985 (the alternate 1985) from 2015, when he bumps into the homeless man, he says some word that doesn't make sense. Sounds like, "Badgent." - JP
  • Explanation: That fact about Marty saying something that doesn't make sense when he runs into the homeless man isn't true. The "weird" word that Marty says is the nickname he gave the man that was said in the 1st movie. - expert

• At the end of the first movie Lorraine and George meet Marty after the dance. Lorraine says "Marty that was very interesting music" kind of like she enjoyed it. However at the end of the second movie she says it differently as if she was confused by it. - SuperMathia
  • Explanation: That is because they had to re-shoot that scene because they had it from a different angle and couldn't get Crispin Glover to be in the 2nd movie. - expert