In notes left prior to the incident Whitman requested an autopsy, to see if there was a medical reason for his uncontrolled aggression. Autopsies and post-mortems were performed, and they confirmed he had a congenital brain tumor, that had recently gone from dormant to active, and the tumor could have caused his aggression.
Houston McCoy and Ray Martinez, the Police Officers who shot Whitman, both sued MGM. Martinez sued because he felt he and his family were portrayed in a manner that perpetuated hispanic stereotypes. His wife wasn't pregnant, and her ethnic background was German-American, not Hispanic-American.
Filmed at the state capitol building in Baton Rouge, LA, due to the feeling by Austin, TX, officials that filming in the actual location would not be in the best interests of citizens affected by the shooting.