Did you know that when Back To The Future first started filming, Michael J. Fox was not the principal actor playing Marty McFly. It was in fact Eric Stoltz who got the part first but after 5 weeks of filming, Robert Zemeckis and Steven Spielberg decided he wasn’t the best fit for the part because of his odd comedic timing. In the upcoming Blu-ray release of the film, a video of Eric Stoltz as Marty McFly is available to watch. Check out a preview of it above. [via]