What are the main diffrences between Harry Potter and the Chamber of Secrets the book and the movie?
The major difference between the book and the movie is that the movie has a number of scenes that are added as a way to make the movie more visually exciting.
For example, in the book Ron and Harry's trip to Hogwarts in the flying car is boring and uneventful. By contrast, in the movie, they are nearly run over by the Hogwarts Express and Harry falls out of the car, with Ron having to hold on to him by one arm and pull him back in. Similarly, the Quidditch match between Slytherin and Gryffindor in the movie includes Harry and Draco flying through the inside of the stands with a bludger chasing them whereas in the movie they stay out in the open air.