According to the DVD commentary the roles that Harrison Ford and Josh Hartnett play in the movie are almost reversed in real life. Gavilan (Ford) is a good shot and almost a stunt driver. Calden is a lousy shot and driver. In reality Ford does not like guns and is a very poor shot at best while Hartnett is a very good marksman, having been through actor basic training for two other movies (Pearl Harbor (2001), Black Hawk Down (2001)) twice. Hartnett on the other hand does not like to drive while Ford is, according to Ron Shelton, "...a maniac behind the steering wheel".
During the shootout in front of Graumann's, Gavilan fires two shots from his sidearm, than the bolt locks open indicating the gun is empty. The camera cuts away for a second or two and when it returns Gavilan is firing again having had no time to reload.