Eric Stoltz was originally cast as Marty McFly , but after five weeks of shooting scenes for the first film , director Robert Zemeckis and executive producer Steven Spielberg chose to re-cast the role to Fox .
Eric Stoltz was originally cast as Marty McFly , but after five weeks of shooting scenes for the first movie , director Robert Zemeckis and executive producer Steven Spielberg chose to re-cast the role to Fox .