[neverending]

It mentioned Clockwork Orange as a film that stirred controversy about real-life violence, as BR did, so I hardly think you can call that being "derivitive." The Lord of the Flies reference was in regard to making you wonder about what you would do in a similar circumstance, not in terms of deriving any actual content from the earlier film.

If this is going to be the basis of citing a film as derivitive, we might as well label every film made in the past 80 years as "derivitive."