 The scene of the Batmobile leaving the Batcave was filmed at Bronson  Cavern in Hollywood Hills. A problem run into when filming the scene  was that the Batmobile was just about the same width as the cave  entrance. To keep from ripping the fenders off of  George Barris (I) (qv) creation, they undercranked the cameras so  it could come out slowly and then later sped up the film to give the  illusion of speed.