War Machine becomes Iron Patriot after Mandarin attacks a Air Force One base, Iron Patriot represents a symbol of America against terrorism
Happy gets hospitalize after Eric Savin who is a driver for Aldrich, beats him up
The Avengers don't get involved because the government want to show they could take care of The Mandarin...
Another one is that Tony isn't going to space, the armor only appears with the other fleet of armors
And a scarred evil Aim agent who has Extremis and tries to take down Tony while he's in Rose Hill
Also guys remember this is the novelization not everything in the novel is gonna be in the movie