The book is similar to the movie, but there are some differences in the movie.
In the book Meg has glasses and braces.The book was written in 1962 and once they made the movie they had computers and internet and was written a long time ago.Camazots was described as bright and shiny.At the end Meg and Charles Wallace went directly home and didn't save nobody.
The things that were the same is Meg thinks she worthless and dumb and stupid.They go to the same town and the same places.They had the same experience with the people.The people were under control of it.The theme was still the same love beats evil.The characters, events where pretty much the same as the story.
The things that were different with the movie