In Harry Hook's 1990 Lord of the Flies film small unimportant details that were changed gave a small twist in every scene, each time blurring Golding's original thinking and theme. The three things that I thought that as a movie following a book, were supposed to be portrayed to capture the real essence of the story,were: the Lord of the Flies, the boy's process to savagery, and Simon's godly spirit.
Being the title of the novel, The Lord of the Flies, obviously is important in the story; the story basically revolves around it… This becomes evident by the middle of the plot when Simon is talked by this evil spirit that is basically the cause of all the loss of innocence and evilness that is destroying civilization between themselves. Yet, in the movie, that part was totally skipped; Simon looks at the sow and leaves. If anyone who hadn't read the book and only watched the movie, wouldn't get the real context that Golding wanted to get across about the evil spirit, that wanted the boys to follow violence, and fall into temptation.
The change in the children, is a support to the theme of Lord of the Flies. It's supposed be evident to the reader the change from when they got to the island to the time they stayed there. The innocence to savagery is not shown as delicately in the movie than in the book. In the movie the evolution from civilization to becoming wild is as if it was just a game from one day to another, and not a slow process toward the pivotal point when they were almost going to kill each other. So it basically leaves you kind of confused, and lost, concerning the inside part of the plot, because you don't see the change with that much importance as it is supposed to be.
Simon is the neutral energy in the island, the Godly figure. The one that helps level the savagery between the kids. In the book, since the beginning, Simon's "goodness" is evident; and as the story goes on, we can see that is more than just a good spirit… Apart from trying to help the little kids, he goes to a peaceful point in the deep forest, relaxes, and connects with nature. By this point, we know that he is more that just a kind-hearted kid. In the movie, Simon doesn't get to be more than a kind-hearted kid, just there; the only part that was important shown by the character of Simon was the scene of his death. Once again the movie abstracted one of Golding main statement, this time of religion.
I believe that as a good reader, you should always understand what you read; stop, analyze, and acknowledge the information. In my opinion, Harry Hook's 1990 Lord of the Flies film didn't portrait the necessary points of the inside and outside plot of the original, and therefore it wasn't as deep and meaningful as the Golding's book.