Steve-O (Stephen Glover) was originally set to cameo in a fight with Val Kilmer's character in the film, but the director elected to changed the scene the night before and Glover's cameo involved him simply wearing a cowboy hat and smiling.
When Frank shoots across the street with a rifle everyone hears the shot, but when his partner did the same thing a few minutes earlier, killing Chloe, no one heard it.
When Frank folds the card and tucks it into the pack of cigarettes the pack is about ¾ full. When the doctor finds the pack on the floor it is full. When Liz takes the card out of the pack it is no longer a tight, full pack. And when she throws it down it sounds empty or at least near empty.
Frank Kavanaugh: There is a conspiracy to kill the President of the United States and I know something but I don't know how and it's happening in your town sheriff.