Continuity mistake: SPOILER: When Calvin dies he pushes the globe and makes it spin very slowly, almost coming to a stop when he falls down. When the angle changes, the globe is spinning really fast.
Factual error: The straw hat worn by one of the LeQuint Dickey Mining Co. employees (played by Michael Parks) is too modern, as it has eyelet air holes and a plastic cord lock on the chin cord.
Factual error: The film is based in 1858 and proceeds through spring 1859. In the scene where Django frees himself from the slavers, one of the three men is wearing a yellow confederate cavalry kepi. The confederate uniforms were only created after the civil war started in 1861.
Character mistake: The check written by Sam Jackson says May 2, 1858. At this point in the movie, it should be 1859.
Continuity mistake: In the scene where Django shoots Smitty Bacall, the plough that he is using can be seen on the far left of the field and moving at a slow pace. But when Dr Schultz puts his wanted poster away, the plough is suddenly on the far right of the field having not had enough time to have turned round and moved that far.
Continuity mistake: When Django is on the hill with Schultz aiming at the farmer, rocks appear in front of him in the angles shot from behind, but disappear in the front shots.
Continuity mistake: In the scene where Schultz shoots the sheriff, as he walks away he has blood on his hand and his jacket. The blood is gone from both in the next shot and from then on.
Continuity mistake: In Daughtrey, Texas when Schultz and Django are having a conversation in the bar the amount of beer in Schultz's glass changes.
Factual error: Throughout the film, Dr. Schulz and Django use what appear to be a Remington Double Derringer. The double barreled Derringer wasn't introduced until 1866.
Factual error: When Django blows up Candyland at the end with a bundle of perhaps 30 or 40 sticks or so of dynamite, he casually moseys out the door, and turns around and watches from maybe 100 feet away. With an explosion like that, completely obliterating an entire mansion, from that distance, the shock wave would have sent him flying and probably killed him. He was far too close to be safe and emerge unscathed from the explosion.
Factual error: When Django and Schulz ambush a group, they kill them with their Henry repeating rifles. That rifle was introduced 2 years later, in 1860.
Factual error: Django carries a Remington "New Model Army" revolver, as does Billy Crash, shown when he holds it to Hildi's temple. These weapons, although based on an 1858 patent, were not produced until 1860.
Factual error: At the end of the movie, Django has a bundle of dynamite strapped to the front doorframe of Candie's house and uses it to blow up the place. The explosion caused by that bundle was way too large compared to the amount of dynamite used. It also shows the house exploding from the center out, distributing debris almost equally in all directions. But the dynamite was at the front door so most of it would have gone backwards.
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 they enter the big house after the funeral, Sam Jackson is singing "In the sweet by and by", the song was written in 1868, the film is set 10 years earlier.
Continuity mistake: When Calvin is explaining stuff about the skull, Schultz's glass swaps from empty to filled, between shots.
Continuity mistake: When Calvin Candie talks to Dr Schultz about his "first, second, third, fourth & fifth concern", his sister Lara puts her glass down on the table, only to have it in her hand again immediately afterwards.
Continuity mistake: When Django gives himself up, the body that he used as a human shield moves from the centre of the door frame to the left of the door frame.
Other mistake: When Schultz meets the Speck Bros. visible breath comes out of the slaves' mouths due to the cold, but not from Schultz or the brothers'.
Revealing mistake: When Ellis Brittle lays dead on the cotton field, a blood pack visibly protrudes from his chest.
Answer: Django and Schultz killed some of Big Daddy's farmhands, and he wasn't going to let a freed slave kill some of his workers. Schultz knew Big Daddy would come after them for what they did. Plus Django would never let go of a chance to kill a slave owner who was trying to kill him.