Film review on Animal Farm

I believe that the book on Animal Farm was very good and the film did a poor job displaying the book. The book was good and all the film had to do was follow the book and it would be a good film but there were some big differences.  

First of all they were missing some characters such as, Clover and Mollie which meant that because these two characters were absent some events that happened in the book did not happen in the film. Also the farmers Frederic and Pilkington are not in the movie so the dispute over the selling of the wood did not happen in the film. And the final thing that was different was the song 'Beasts of England'. In the book there is specific words to the song. But in the movie it is just a rhythm and I think that was wrong.