Calvin Candie compares a slave to a teddy bear, even though teddy bears were not invented until the time when Theodore Roosevelt was president, hence the name "teddy". Oddly enough, the film is set in 1858, that president's birth year.
Stephen (Samuel L. Jackson) uses the word "motherfucker" four times throughout the film. This is a linguistic anachronism as the word didn't exist until the WWI era (the Oxford English dictionary lists the earliest use in 1918).
The film mentions Lubbock, Texas. Lubbock did not exist in 1858 and would not come into being until well after the Civil War (Lubbock was founded in 1876 and the film is based in 1858 and proceeds through the winter into the spring of 1859). In 1858 the Panhandle of Texas was not traversed by the faint-hearted as it was essentially populated by only Kiowas and Comanches.
The movie depicts the characters having and using guns that employ metal cartridges. Those would not be available in 1858, the standard round at the time being a paper cartridge containing powder and ball and a separate percussion cap.
Dr. King Schultz uses the word "Panache" at the meal scene with Calvin Candie, defining it as "as sense of showmanship" (emphasized with gesture). This usage of the word originated with Edmond Rostand's play, "Cyrano de Bergerac," which was created in 1897 (38 years after the scene in the movie). Prior to this, usage of the word was either literal or pejorative; it was literally a "plume" on a helmet, or foppish ornament.
Several characters pronounce the word "valet" to rhyme with "ballet." This mispronunciation did not gain popularity in the United States until after 1950. Before then, it was pronounced to rhyme with "mallet."
When Dr. Schultz draws beer from the tap waiting for the sheriff to arrive, he sweeps off the foam with a stick with the beer brand "Knickerbocker" clearly printed on it. It was first produced by New York brewer Jacob Rupert in the early 20th century.
At 1hr 15mins, Django is seen wearing sunglasses. This is 1858/9 and sunglasses proper did not appear until the 20th century. This is almost certainly an intentional oddity introduced by director Tarantino.
Calvin Candie drinks a tropical drink through a straw. Straws were not sold commercially until 1888, although hollow reeds were used as straws before then. However, the straw in the film does not appear to be a reed.
At the Cleopatra club, the winning fighter receives a typical bottle of beer, similar to the Dutch Grolsch bottles, however, this type of bottle was not patented until 1875 by Charles de Quillfeldt, 16 years after the time the movie is set in.
During an auction, Dr. Schultz calls out, "Sold, American!" But this line wasn't made famous until the 1920s when fast-talking auctioneer 'Speed' Riggs said it at the conclusion of Lucky Strike radio commercials. Also, "American" is in reference to the American Tobacco Company, which wasn't in existence until at least 20 years after the time the film is set in.
The sign painted on the window of the records office in which Django and Dr. Schultz find who purchased Broomhilda has the words "Slave Sales" set in a typeface that appears to be Helvetica. Helvetica wasn't released until 1957, 99 years after the events in the movie take place.
The revolver Jason Patric holds against the head of Kerry Washington was supposed to represent, I suppose, a Remington New Army model of 1958, but not only is the weapon made of stainless steel (it appears to be a replica manufactured by EMF), which was not available in 1958, if you look closely you will notice safety notches milled between the percussion nipples; these first appeared in the improved model ten years later, in 1868.
Early In the film, when Django and the Dentist are In the Saloon, the Dentist uses a hand-pump to fill the glasses with Beer. Such dispensers need to be pumped several times In order to fill each glass, but here the liquid flows continually as soon as the handle Is opened, which means the Beer must be artificially Carbonated and under pressure. Therefore both the drink and method of delivery are far more modern than what would have been possible In the 1860's.
After Django and Dr Schultz have ambushed the cowboys, Dr Schultz is seen removing a bullet shell from the rim of his hat and drops the shell on the ground. A metallic 'ping' sound is heard when it falls on the ground off screen. But as they are standing in the snow, the sound of the shell falling on the ground would normally not be heard.
Before Django, Calvin, and Dr Schulze arrive at the plantation, Stephen fills out a check to The Harris Feed Co. for "Sixty Five Dollars", but the numbered amount is for $68.00. After Stephen stamps the check, the camera zooms on the check revealing a different check for the right number amount of $65.00.
When Butch pulls a shotgun on Django and Dr. Schultz at Calvin's dinner table, he pulls out his revolver to point at the Doctor. Yet in the next cut he is pointing only the shotgun at Django, then the next cut he is again holding both weapons.
When Django and Dr. King Schultz ride in to Candyland for the first time the fields in front of the gates are harvested/cut. When Django and Broomhilda leave Candyland together the fields have tall grass.
After the foyer shootout at Candyland when Django is seen hiding underneath the knocked-over cabinet about to surrender, a body is shown lying on its back directly in the middle of the hallway. Moments later as the camera pans over the array of bodies from the shootout, the body is moved to the left side of the hallway closer to the wall.
When the group first arrives in front of the house at Candyland, Stephen comes out to speak with Calvin Candie. When shot from behind, Candie is sitting in the carriage with his legs crossed and when the camera angle switches to the front his legs are uncrossed. Also, when Candie reprimands Stephen about D'Jango "sleeping in the big house", the shots from the front show Candie's pipe in his right hand and when the camera angle switches to the rear shows his pipe in his left hand. Both Candie's hands, his pipe and his legs being crossed alternate back and forth a few times based on the camera angle.
When Django is learning he is allowed to dress himself as he pleases, as he tosses the hat onto the bust in frustration, it rests off-center and pointing to the floor. But when the camera cuts back, the hat is suddenly level.
While Schultz was talking to Big Daddy on his cart, right after he introduced his horse, Fritz, we can see 6 people walking toward them near the gate. When the scene cuts to focus on Django, only 3 people are shown where there were 6. Then when it switches back to both Django and Schultz, there are again 6 people there.
When Big Daddy turns up after Django and Schultz shoot the Brittle brothers, his hair is damp under his hat, when the camera jumps back to him it's back to being dry, it changes back and forth with each different camera cut.
As Schultz and Django ride up to the mansion the first time, the sun appears to be setting (or rising) from the left. As the scene progresses, the sun shifts sides, throwing the shadows of the shrubs and actors in opposite directions. This continues through the scene; sun from the left, sun from above, sun from the right, overcast.
On the way to CandyLand, Django pulls one of the henchman's horses to the ground, bringing the rider with it. In the next shot, the rider is still on the ground, but the horse is suddenly upright as though nothing happened.
When Broomhilda is instructed to sit down at the dinner table, Stephen puts his hand behind her neck with his fingertips visible. In the next shot, and for the rest of the scene, his fingers are not visible.
After Django shoots Miss Laura, he tells Cora and Sheba they can leave Candieland. Cora is seen going out the door of the mansion with an oil lantern. Cut to Cora running towards the entrance gate and the lantern has disappeared.
When Big Daddy and his group of raiders first spy on Django and Schultz's camp, the Brittle brothers are all laying side by side. When the raiders ride into the camp, however, it appears as though the Brittle brothers have been suddenly stacked on top of one another.
The innkeeper tells Dr. Schultz that he won't be open for an hour, and will be serving breakfast, not beer. But when Schultz draws beers for himself and Django, the stick Schultz uses to clear the foam "head" from the glass is already wet, indicating it had been used earlier that day (or in an earlier take).
When Dr. King Schultz is speaking with the four remaining slaves (after freeing Django), he is holding the reins of his carriage with his right hand and is gesturing with his left hand. When the camera angle changes mid-sentence, he is holding the reins with his left hand and his right hand is suddenly raised.
When Dr. Schultz and Django are riding into Daughtrey, they encounter a young goat herder with a herding staff in his left hand and a leashed goat in his right. In the next shot, the staff is in his right hand, and the goat in his left.
As Calvin Candie rides in the carriage towards his house the smoke from his cigarette blows away to his right. When the carriage then parks up for him to introduce Schultz and Django to Stephen the smoke is blowing across in front of the house, i.e. in the opposite direction.
After Calvin Candie signs Broomhilda's papers, Dr. Schultz speaks about D'Artagnan, and about Calvin Candie naming him. However, Calvin purchased D'Artagnan for $500 as an adult Mandingo, so it's reasonable to assume he already had a name.
When Django lights the fuse to blow up Candieland the sparked-fuse burns from right to left up over the door, ..cut to the last shot of Stephen.., and return back at lit fuse which is now burning from left to right but then cut again and it hits the dynamite from right to left, the original burning direction.
When arriving at the main house at Candyland, Calvin Candie is sitting on the carriage telling Ben to get the room ready for Django. In one shot Calvins legs are crossed, in the next shot his legs are not crossed.
When Dr. Schultz is casually mentioning to Hildy that there is a "friend" on the other side of the door behind her, many reflections of activity by the crew and camera are seen reflected in the glossy bedpost behind Schultz, as he sits in his chair. Neither character, in this scene, is moving.
In the film there is a cotton plantation located in Gatlinburg, Tennessee. This region (The Grand Division of East Tennessee) is very mountainous and inhospitable for cotton, preventing large plantations from arising. As a result, the region had a low slave population which translated to anti-slavery and pro-Union sentiments in the years leading to the Civil War.
Dr. Schultz advises the freed slaves to head north, and to help them do this he points out the North Star. But as they turn around to look at the night sky, everyone is facing the moonlight coming through the trees - and the visible moon is only ever due north at midnight in the southern hemisphere.
The profile on the door sign to the Cleopatra club and the bust in the entry hall is not Cleopatra but in fact Nefertiti. Also the bust and related profile wouldn't have been known in the 1850 due to the fact that the bust wasn't discovered until 1912.
While discussing Alexander Dumas' feeling towards slavery, King Shultz says that "Alexander Dumas was black." But the takes place in the 1850s, and Dumas dies in 1870, so he should have said that "Alexander Dumas IS black."
Everybody in the film seems to have perfectly white teeth, even the slaves. In realty, it would be very unlikely for all those people to have white and healthy teeth in the 1800s. Because slaves probably didn't even have the chance to get any dental care, nor even had a tooth brush and paste. And most others were likely to be in the habit of chewing tobacco. And personal hygiene wasn't very common and probably wasn't practiced at the extend that it does today. It all makes the opening sequence even more ironic, considering that one of the main characters, a dentist, arrives in a mobile dentist clinic.
During the opening credits, the Speck Brothers have Django and five other slaves in chains. When Dr. Schultz catches up to them after the credits, there are only four other slaves. However, this is because the slave march depicted in the opening credits takes place over a week or more. At least one of the actors is different, because slaves were swapped out along the march, possibly including death. It has been stated in interview that this was deliberate, to depict the way a slave march would actually be.
The men in hoods pursuing Dr. Schultz and Django are often mistaken for the KKK, which wasn't founded until 7 years after the events of this movie, in 1865. However, according to Quentin Tarantino the men are predecessors to the Ku Klux Klan called the Regulators.
Calvin Candie is seen smoking cigarettes in several scenes. The year is 1858. The cigarette was not mass manufactured in the USA until 1881. However, cigarettes were widely distributed in Europe at the time, and since Candie is a wealthy Francophile, it is not unreasonable that he would have them imported from France.
As Dr. Shultz takes aim at Ellis Brittle, he keeps moving the rifle to his right, so Brittle is riding in a direction where his right side would be closer to the shooter, and he would have been hit on his right side. However, as Brittle is falling off his horse, there is no wound on his upper right chest. The wounds are on Brittle's left upper chest, with another wound at about his right shoulder blade. With the angle at which Shultz was shooting, the wounds should be on the right upper chest and left upper back.
After the shooting starts at Candieland, four men burst in through the front door after hearing the gunshots inside and are mowed down by Django. The door has a medallion in the center. When the men burst through the door blood is shown splattered on one side of the medallion and after a quick cut blood is now splattered on the opposite side of the medallion.
At the end just before blowing up Candieland, Django mentions Stephen's age, 76yrs old. How could he have known his age which meant Stephen was born around 1782 making him 76 in 1858, the time of this movie.
After Candie is shot by Dr. Schultz, the camera zooms in on Stephen as he screams. For a brief moment, Butch is looking over his shoulder at Candie after he falls to the ground, all while pointing his gun at Broomhilda. However, once Stephen begins walking over towards Candie, it is shown that Butch is still facing Broomhilda and had not turned around yet. The camera then zooms in on Butch as he looks over his shoulder to see what happened.