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)
Marty successfully sets up his parents and saves his future. Marty's dad triumphs over Biff and becomes popular. Doc is able to return Marty to the future using the lightning that hits the clock tower. At Twin Pines Mall, Doc wears a bulletproof vest to protect himself from the Libyans. In the present day, Marty's dad is a famous writer and Biff works for him, waxing his car. Marty and his girlfriend Jennifer are reuniting when Doc arrives in the time machine. He tells them that they must go 30 years into the future. The car flies up into the air and off into the future. To be continued...
Dr. Emmett Brown: Don't worry. As long as you hit that wire with the connecting hook at precisely 88mph the instant the lightning strikes the tower... Everything will be fine.
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