Book vs Move

Piggy dies first and then Simon dies soon after.
The Pig talks to Simon.

The boy who claimed to have seen the beast goes missing.

These are things that are only in the book.

The boys smoke out Ralph to kill him.

Simon dies and then piggy dies the next day.

These are things that are only in the book.

The plane crashes on an island leaving a group of boys alone to govern themselves.
The hunters are always howling and barking like wolves.

A small boy claims he sees a beast.

These are all the things that are found in both the book and the movie.