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Movie Trivie
In the opening sequence, all of Doc's clocks read 7:53 (25 minutes slow) except for one clock. It is on the floor next to the case of plutonium and it reads 8:20. There's also a black and white picture of a man hanging on the town hall clock of Hills Valley, the way it happened right before the lightning strikes it in 1955.
The time machine has been through several variations. In the first draft of the screenplay the time machine was a laser device that was housed in a room. At the end of the first draft the device was attached to a refrigerator and taken to an atomic bomb test. Robert Zemeckis said in an interview that the idea was scrapped because he and Steven Spielberg did not want children to start climbing into refrigerators and getting trapped inside. (See also Indiana Jones and the Kingdom of the Crystal Skull.) The Nevada desert bomb test was left out in order to reduce the budget. In the third draft of the film the time machine was a DeLorean, but in order to send Marty back to the future the vehicle had to drive the DeLorean into an atomic bomb test.
The script never called for Marty to repeatedly bang his head on the gull-wing door of the DeLorean; this was improvised during filming as the door mechanism became faulty.
Canadian pop singer Corey Hart was asked to screen test for the part of Marty.
Apparently Ronald Reagan was amused by Doc Brown's disbelief that an actor like him could become president, so much so that he had the projectionist stop and replay the scene. He also seemed to enjoy it so much that he even made a direct reference of the film in his 1986 State of the Union address: "As they said in the film Back to the Future, 'Where we're going, we don't need roads.'"
When Lorraine follows Marty back to Doc's house, she and Doc exchange an awkward greeting. This marks the only on-screen dialogue that Christopher Lloyd and Lea Thompson ever have, though they have appeared together in five movies and one TV movie.
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