When Marty goes back in time and finally speaks with his relatives, he tells them his name is Clint Eastwood. At the end of the movie, during the showdown, Marty is shot. when he gets up he pulls back his poncho to reveal the metal plate. Clint Eastwood does the exact same thing in the movie 'A Fistful of Dollars'. Marty is also wearing the exact same outfit that Clint Eastwood does in that movie.