Factual error: At the end of the movie, when Burke faces Sheldon, he tells him "one of the secrets about owning a gun: You have to cock it." But since Sheldon's weapon was a double-action revolver he doesn't have to cock it. He could just pull the trigger.
Factual error: When Randall is covered in gasoline, he would have been immediately immolated as he struck the match, as the fumes from the puddle of gas around him would have ignited.
Factual error: Smoochy gets tricked into performing at a Nazi rally in New Jersey but the police bullhorn says NYPD and his mugshot is also NYPD.