One thing that stuck with me from my recent reread that they didn't have in the movies was what happened with the traps they set against the rebels in the capitol when the final fight was happening. That as the rebels advanced pods started to go off and mutts attacking the capitol citizens. They cared more about keeping control than protecting the citizens. But that was why the strike against the kids that killed Prim was so easily attributed to them and why Katniss had more trouble figuring out who did it.