A few weeks before filming started, Balthazar Getty fell out of a tree and broke both his wrists on his arms. The director decided to write his injuries into the script and put the character Ralph's arm in a sling for half of the film. Reportedly, the then-young actor was in pain throughout the shoot.
The original final script had over 70 uses of the f-word. The studio decided it would be cruel to make 12-year-olds swear against their parents' wishes and removed the excess use of the expletive.
Chris Furrh was in another movie this same year about a group of kids stranded alone on an island: Exile (1990).
The title 'Lord Of The Flies' comes from the Hebrew translation of Beelzebub, and it is one of the seven names for the Devil (according the seven deadly sins in the Judeo-Christian tradition). Beelzebub is the personification of the sin of gluttony.