To start off I am just going to say that I love Ender’s Game and I have read it several times. Due to that I know a lot about the book. I am not saying that I know everything in the book because I do not. I also know that movies have limits but some of the things in the book just made me go a little bit crazy. (Please note there will be spoilers)
Let me start off with my biggest problem: Bernard. In the movie he was everywhere. I felt that the director or whoever was in charge of who was in what scene looked at a scene and were thinking, “We need someone here, oh I know, let’s put that minor character Bernard in this scene.” Bernard has such a small role in the actual book seeing him everywhere just drove me insane.
The next thing that drove me crazy was the person they chose to portray Bonzo. It is not about his acting skill, I felt everyone did a good job in the movie. My problem was his height. He was smaller than Ender in the movie. In the book he is both older than Ender as well a taller than Ender. In fact in the scene that he fights Ender he makes it as even as possible but then says that it is not his fault he is taller than Ender. Another thing is that Bonzo was actually one of the worst commanders when Ender finally became one. Even when Ender was not commander Bonzo was still only second or third place but he commanded everything and did not allow Ender to even enter the battleroom till five minutes in and then he was not allowed to move. In the movie he had apparently not lost one game.
Next is the battleroom. In the book there are several of these rooms shaped in a cube. There can or cannot be “stars” in the room and it can change its level of darkness in the room to make it harder or easier. In the movie it was just one large glass circle and it somehow was bright in there even though in reality most of the light would just go through it and the only places with lights would be the people and the “stars”. They also completely brushed over all the rules of the battleroom.