Revealing mistake: During the shooting in Candieland, right before Django bursts a man's head, a man next to Django who he uses as a shield has his chest burst. The blood pack is very noticeable.
Factual error: When Big Daddy is on the front porch talking to Bettina there is a security camera above and to his right on the porch overhang.
Continuity mistake: In the final scene where Django asks Cora to say goodbye to Miss Lara, he holds his arm with the gun outstretched, but in the next frontal shot he keeps it lowered.
Chosen answer: There is nothing in the film to indicate that he is not. He has the paperwork to prove the bounty he was pursuing, and he is not held by the authorities or charged with any crime, so we can assume that he was.