Book to film comparison of Enders Game

(WARNING: MAJOR spoilers ahead. DO NOT READ unless you've read the book AND seen the movie. You've been warned!) Things the same: Ender's inner conflict and reaction when he realizes he unknowingly committed genocide. 

Differences: Peter is not as murderous and psychopathic as in the book. An unnecessary scene with Ender and Valentine, that just slows things down and isn't important to the story at all. Ender does not accidentally kill other kids out of anger, just kind of paralyzed them. No mention of Peter and Valentine writing articles that negatively criticize the government.