Anachronisms: Coffer is seen using a Model 1903/A3 bolt-action rifle on the rooftop during the bank shootout scene. The /A3 model is clearly distinguishable from its earlier predecessor, the Model of 1903, by the rear sight placement on the rifle. The Model of 1903 used tangent sight located on the barrel, in front of the receiver, whereas the newer, improved variant used a "peep" sight located on the receiver bridge nearer to the bolt handle. The /A3 variant was a World War Two (circa 1941) improvement on the older model of 1903. Coffer should have been seen using a Model 1903, instead of a 1903/A3.
Errors in geography: Every time the gang crosses from Texas into Mexico, the river is running to the west. The Rio Grande actually flows in the opposite direction.
Continuity: When Pike shoots Buck to put him out of his misery after the opening sequence, Buck is first shown turning to the left as he falls - when we cut back to his fall he is clearly turning to the right
Crew or equipment visible: At the end of the opening sequence, when Crazy Lee shoots three lawmen, the electrical line to the squibs is visible.
Anachronisms: At least twice in the movie, characters refer to Gen. Huerta as the president of Mexico. This would place the time period between early spring of 1913 and the summer of 1914. However, when Sikes is telling his colleagues about a "flying machine", Pike informs them that he heard the machines would be used in "the war", which would place the time period late 1914, after Huerta had been overthrown. Also, at least twice during the film a character refers to Pancho Villa indicating he was a major figure in the rebellion against Huerta. During the revolt Gen. Venustiano Carranza was the leading rebel; Villa was a minor figure, although he did ally his forces with those of Carranza (he also later led a rebellion against Carranza after Huerta was overthrown). Mentioning Villa's name may have been an attempt to place a well-known name before the audience to give them an historical context.
Audio/visual unsynchronized: When Lyle and Tector are shooting at the wine casks, the slide on Lyle's gun is locked indicating the gun is empty. However, shots are still heard. In the 1995 re-release version this has been corrected. Only one shot is heard after the slide locks on Lyle's .45, and that shot comes from Tector's revolver.
Continuity: When Mapache is standing on the railroad tracks directing the battle against the rebels attacking the town, a soldier standing next to him is shot in the chest and falls at his feet. However, in the very next shot, from behind Mapache, the dead soldier's body is nowhere to be seen.
Anachronisms: The machine gun used at the end of the film is a Browning model 1917, the film is supposedly circa 1913
Continuity: During the opening shootout, a bald bounty hunter wearing a dark orange shirt and brown vest is killed with a shotgun blast. At the end of the scene, he can be seen exiting the hotel with the other bounty hunters, alive and well.
Continuity: In the opening scene, all shots of the bounty hunters on the rooftop show heavy storm clouds in the background, but all shots from the Bunch's/townspeople's POV show a clear, sunny day (including over the roof of the hotel).
Revealing mistakes: In the shooting in the beginning, one of the bounty hunters is shot and falls off the roof. When he hits the ground, one can see the ground break in where the air bag is hidden to break his fall (in the director's cut).
Factual errors: In the opening scene, as well as later, Coffer is shooting an "06". The rifle depicted is a .30-06, but it is not the M1903 then in use by the U.S. Army. It is a M1903A3 which was not produced until World War Two.
Factual errors: In the scene in which Angel shoots his girlfriend, and the Wild Bunch is confronted by Gen. Mapache's men, Commander Mohr asks them about their weapons, and informs them that they are U.S. Army weapons and cannot be owned by civilians. However, the only U.S. Army weapons which they possess are M1911 Colt pistols, which in fact had been sold commercially since 1911, two years before this film takes place.
Factual errors: The American soldiers in the movie wear a pattern of shirt which buttons all the way up the front. During this period of time, U.S. Army shirts were pullovers and buttoned part way down the front. The shirt depicted in the film is similar, but was not adopted until later.
Factual errors: Gen. Mapache's German military advisers stated that they were officers of "The Imperial German Army". At the time of this film's setting, 1913, the only German military forces belonged to the states of Prussia, Bavaria, Saxony and Württemberg, and they weren't called the "Imperial German Army". The filmmakers most likely meant the Imperial Prussian Army, as Prussia was ruled by a king and its army was generally regarded as among the best in Europe. It was also known to hire out its officers as advisers to foreign armies.
Continuity: When Sykes (Edmond O'Brien) is shot by the posse while bringing the horses to Pike and the boys, its the right leg that gets the wound. But, when he shows up at the end, his left leg is bandaged.
Miscellaneous: During the walk to get Angel, Ben Johnson gets too close to Warren Oates, and Oates slightly pushes Johnson out of the way.
Factual errors: Early in the film, Harrigan threatens Deke Thorton by promising to send him back to Yuma if he doesn't catch Pike. In reality, the Yuma Territorial Prison had already shut down in 1909, roughly four years before the events of the movie, and had been converted to a high school.