Although the movie portrays Nautical as originally a nondescript stock horse, he actually was by an American Quarter Horse names Muchacho de Oro out of an Army Remount mare of mostly Thoroughbred breeding. Nautical's registered name was "Peter de Oro." Prior to his Olympic fame, he actually had a reputation as a temperamental jumper who was inclined to stop at water and ditch jumps. When he was obtained by Hugh Wiley, Wiley enlisted the help of the United States Equestrian Team Coach Bertalan de Nemethy, and together the two men trained him to be the Olympic level jumper he became.