 CONT: When the original actor playing Mr. Hughes died in the middle  of filming, he was replaced by a double, who completed his scenes  with his back mostly to the camera. Apparently, however, nobody  noticed that the original actor had significantly darker hair than  his replacement. Therefore, Mr. Hughess hair turns white in several  scenes, including the sequence where his wife says goodbye to him in  the casino, and his confrontation with the count at the villa.