Revealing mistake: In the scene where Doc Brown is following Biff into the tunnel, as Marty starts to pass between the cars on his hoverboard, one of the wheels on the rig supporting the hovering DeLorean is visible. (01:30:30)
Dr. Emmett Brown takes Marty and Jennifer to the future to help their kids not to ruin their lives.
After doing that, Marty buys a sports almanac for 1950-2000, thinking it might help him in his time. Doc finds out and throws it away, but the 2015's Biff (very old now) finds it and uses the DeLorean to give the almanac to the young himself.
When Marty and Jennifer arrive back to their own time, they find it totally different - Biff is very rich, he practically owns the city, he married Marty's mom, killed his dad, and when Marty starts to ask about the almanac, he wants to kill him too.
Doc also finds out that he was imprisoned as a lunatic, so the two go back to 1955, the night of the Enchantment-Under-The-Sea party to take back the almanac.
Biff: Go ahead, kid. Jump. A suicide will be nice and neat.
Marty: What if I don't?
Biff: [raising gun] Lead poisoning.
Marty: What about the police, Biff? They're gonna match up the bullet with that gun.
Biff: Kid, I own the police. Besides, they couldn't match up the bullet that killed your old man.
Marty: You son of a...
[Biff pulls back on the gun's hammer.]
Biff: Suppose it's poetic justice. Two McFlys with the same gun.
Trivia: In an interview, the director stated that hoverboards were real, but they weren't on the market because parents didn't like the idea of floating children. He said this as a joke, but this didn't stop mass hysteria as thousands of kids went from store to store looking for hoverboards.
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