Even classic films like Back to the Future aren't born fully formed. Script and story elements are often changed, sometimes for the better. Like Doc's fearless friend Einstein-
Instead of a dog, he was originally supposed to be a chimpanzee:
And that amazing time machine- the Delorean?
It was originally supposed to be a refrigerator:
The character of Biff Tannen? Tim Robbins was once considered for that:
And Eric Stoltz wasn't the only alternative Marty McFly. Ralph Macchio was considered for the role as well.
Films are merely the sum of their parts. Change one thing and they might fall down. Change many things and they might just be remembered for generations.
