A few things though that had bugged me in the movie was that Jack Starbright, Alex's new guardian, doesn't have a fighting seen in the book, and she is suppose to be a red head not a blond. Also that they hadn't put in the scene where Nadia Vole, Gregorovich's right hand, tricks Alex into thinking that she is a double agent and then sneaks him into the giant fish tank where a giant jelly fish was meant to sting and kill Alex. Another thing that I was completely upset about is that Sabina Pleasure isn't suppose to enter the Alex Rider series until the third book, Alex Rider: Skeleton Key, where he meets Sabina at a Wimbledon Tennis Tournament where they are both working as ball kids.
Note: The book is better then the movie.
"When the doorbell rings at three in the morning, it's never good news.”
-Anthony Horowitz, Stormbreaker
Missing Chapter from the Alex Rider book Stormbreaker:
http://alexrider.wikia.com/wiki/Stormbreaker_(novel)