Factual error: This is also in the original Golding novel - Piggy is nearsighted, which is corrected with negative (diverging) lenses. A positive (converging) lens is necessary to focus sunlight. However, the boys use his glasses to make fire, but they would not work.

Audio problem: When Jack says "Anyway, the conch doesn't count on this side of the island", he is clearly biting his banana and eating it, however the dialouge is heard perfectly clear, even though he is eating.

Revealing: After there has been the vote for chief, behind one boy you can see a piece of wood reading "Anthony M," a marker for showing where the actor (Anthony McCall-Judson) should sit.

Factual error: Take a look at the size of the rock that the boys push onto Piggy. A rock of that size, falling from that height would've exploded Piggy's head like a ripe melon. It also would've crushed his body into a mangled heap.

Continuity: In the scene when Sam and Eric are sleeping by the fire, Sam is on the left side of the screen and Eric is on the right, and Eric has a rip all the way down the back of his shirt. Later, Eric gets up and moves away and calls for Sam to join him. In the shot of Sam moving towards Eric, his back is to the camera and you can see that Sam's shirt now has the rip - not Eric's.

Audio problem: In the scene when the boys are going up the mountain to search for the beast, Roger is standing slightly down the slope in relation to Ralph. After Ralph says something about not leaving the littluns with Piggy, Roger's mouth moves but no sound comes out. He probably had a line there, but they decided to take it out when they were recording the sound.

Continuity: When the kids are dancing near the fire, you can see that their wooden spears are not sharpened on either side. But when they kill Simon they are sharpened somehow.