Number of prisoners in the wagon varies between close and long shots.
After Jed was cut down from tree and put in wagon with other prisoners, the outfit of the man steering the wagon changes during the short trip. Noticeably, he had a dark blue outfit one with no bandanna and then a lighter-colored outfit with a red bandanna.
During the hanging just before Jed was shot, 6 men were hanged, yet the hangman pulled only 4 pins.
The length of Miller's beard seems to vary considerably from shot-to-shot, especially during his fist-fight seen with Cooper on their way back to Fort Grant. He appears nearly clean-shaven, but once on the ground, his beard is quite heavy. In contrast, Cooper's facial hair never changes.
When Jed Cooper is having shackles attached he has a cut and swollen right eye. After the preacher is shot a close up reveals him to have no injury at all, no bruise cut anything.
At the end of the film, Cooper tells the judge to pardon Jenkins for his role in Cooper's attempted lynching. As Oklahoma was not a state in 1889 (the year the movie takes place), and hence has no state law enforcement, those duties fell to the federal government. This is why Cooper is deputized a U.S. Marshal. The only person who can issue a pardon for a federal crime is the president of the United States, not the judge of the territory.
During Cooper's testimony in court he wears his sidearm onto the witness stand. No one on either side of the law would be allowed to do this, especially in a federal court.
When Jed and the posse catch up with rustler Miller and the brothers, the dead man's son grabs a lariat and rages about stringing them up right then and there. However, the landscape around them is all southwest desert, without a single tree anywhere in sight.
In the beginning of the movie Clint Eastwood is loaded into the prisoner wagon, the next scene is a frontal view of the wagon showing the driver sitting on a shiny red plastic cushion. The red cushion is removed from the remaining shots of the drivers seat throughout the rest of the movie.
After Cooper is brought to Judge Fenton's office, the judge tells him McCloud is being led to the gallows outside to be hanged for killing Johansson. He then asks Cooper if he wants to see what he looks like, directing him over to the window overlooking the gallows. This is not a goof. Cooper had not been present at the man's trial and the judge wanted to confirm that the man being hung was the man Cooper thought was McLeod.
The prostitute Marshall beds before the hanging has an inoculation scar on her shoulder. However, this is not a Goof because smallpox vaccination scars were becoming common in the 1850s - before the time of this film.
During the opening credits, the camera is on the ground looking straight up at the bottom of Jed's boots after he has been hanged. His body is rotating in a clockwise direction when it suddenly begins to move in a counter-clockwise direction. The film has been reversed at this point. If his body naturally changed direction, it would have slowed to a stop first.
When Marshal Cooper wakes up in the hotel after returning with the three outlaws, you can hear a man and woman cooing and laughing in the background, if you listen carefully, you'll notice it is on a loop and keeps playing over and over again
Obvious stunt double when Jedd is being roped at the beginning of the film before and while he is dragged through the river.
When Jed speaks to the Judge when he is being released, the prisoner in the background changes to a dummy in the long shots and then back to a person three times.
When the Judge goes to visit Jed Cooper in the hotel after he's been shot you can see a painted background in the front doorway that has a shadow cast upon it that reveals the background is a one piece painting.
When Jed is hanging on the noose, you can see the film being reversed back and forth to see his feet go back and forth in the same pattern for 10 seconds.
Some DVD box covers describe the events of the movie as taking place in the year 1873, yet in the movie itself Judge Fenton ('Pat Hingle') clearly states that the events of the movie take place "in the Year of our Lord, 1889".
The gallows (which is capable of hanging 6 men) has only 4 trap rings attached to it.
When the madam opens the door to let in the judge, the image seen across the street is an obviously two-dimensional painted flat.
After Clint Eastwood is placed in the prisoner wagon during the opening credits, the shots of the front of the wagon show the driver sitting on a 60's-era red vinyl bench cushion.
As the wagon pulls into town a few moments later, the cushion is gone.
When Jed is rescued from the noose, a white vehicle can be seen flashing quickly between the trees in the distance.
When Cooper is pushing through the crowd at the mass hanging a man behind him is wearing glasses with black plastic frames.
Marshall Jed Cooper (Clint Eastwood) exclaims that he has a "prisoner in another town in a cardboard box jail", when in fact cardboard was not invented until 1890 in Germany, a year after the film takes place.
Near the end of the film when Cooper assaults Captain Wilson's house, it is guarded by a German Shepherd which didn't come into existence until 1894-1899 which is well after the time period of this film.
On the evening before the hanging of the six prisoners, a man suggests that people have been setting up tents in the "boondocks". "Boondock", derived from the Tagalog bundok is an expression introduced to English by American soldiers in the Philippines during World War II, well after the period of this film.
(at around 52 mins) Just before Jed and Miller have their fight in the desert, Jed says, "Get aboard, Miller." When he says that, his lips don't appear to be moving.
When the audience is singing "Gather at the River" right before the six-man hanging, their mouths do not match the words of the song. The video and audio were not synchronized very well in most of the shots.
Towards the beginning of the movie, when Jed is about to be hanged, he says, "You're making a mistake," but his lips don't move when he says it.
At the beginning of the movie a piece of camera equipment can be plainly seen lying on the bottom of the gallows.
When Jed is being bought breakfast in bed, the shadow of one of the camera crew's head is visible.
As Cooper walks across the road to the jail where the Sweed is held, you can see the shadow of the camera crew at the bottom of the screen.
During the preacher singing on the gallows, in the background visible power lines are noticeable near the trees to the upper right portion of the screen (1h18m25s in).
The map the judge has in his office, clearly shows the modern outline of the state of Oklahoma in RED. It includes the "panhandle", which up until 1890 (the movie takes place, at the latest in 1889) was referred to as the "the unassigned territory", having been severed from Texas. It was for a time, called the Cimmeron Strip, and vied for its' own form of government). The map is clearly in error, and shows a post - statehood version of Oklahoma (1907, although the territory created in 1890-91, is the same as the current state).
In addition, the assigned areas (by nation/tribe) on the maps do not appear to resemble any know demarcations from any maps which are publicly available.
In addition, the assigned areas (by nation/tribe) on the maps do not appear to resemble any know demarcations from any maps which are publicly available.
When Jed and the posse track down Miller and the two boys the posse wants to hang them. Question is where? There are no trees around.
When Rachel is in the store and the Marshall comes up on horseback as Rachel comes out on the boardwalk you can see a modern brick building, presumably studio offices, in the far background.
When Jed gets a horse from the blacksmith early in the film, the horse is brown with a white blaze down his nose. In the next scene as he's riding towards town the horse has a blaze that goes across the top of it's eyes. It's a different horse. Then, it seems, later he's got the original horse again.
In the establishing shot from an angle behind the gallows, all of the extras except for one is looking up towards the gallows stairs. The is an old man in a white shirt with his hands on his hips who takes a long look directly at the camera.