The original final script had over 70 uses of the F-bomb, but the studio decided it would be cruel and inhuman to make 12-year-olds swear against their parents demands.
When Ralph calls assembly to discuss demerits for stealing, Roger's pants have been cut off to make shorts. But later, when Jack, Roger and some boys are throwing rocks at the fishing boys, Roger's pants legs are intact.
During one of the signal fire scenes shot at dusk the fire can be seen burning in reverse, flames backing in towards the fire instead of shooting out from it.