Lord of the Flies (Dir. Peter Brook, 1963)

To watch the complete film with Spanish subtitles (but low quality):

Original version (English) with Spanish subtitles
Original version (English) with Spanish subtitles

You also can watch a booktube (visual book review in YouTube)by two 3rd ESO students. Mainly on the book in which the film is based.
Spanish

Film (Color Version, 1990)scene on Rousseau's Thesis
Spanish