A "further adventures of" production
dat is quietly/surreptitiously released instead of being openly advertised/hyped, possibly because of
said film's
boring nature, unpopular political views, copyright issues, etc.
Creating a sneakquel to a well-known Hollywood masterpiece might
indeed keep you out of legal trouble, save you from public ridicule/outrage, and so on, but it might also take a while for said celluloid-
based work to become known to
da general viewing-audience.