- Continuity: The amount of straw that hits Butch while he is riding the bicycle.
- Continuity: In the opening sequence when Sundance shoots the gun belt off the card player, the film was cut to make the quick draw appear faster. You can see Butch's image jump across the screen in the background.
- Continuity: The "foot pegs" through the front axle of the bicycle that Etta uses disappear during Butch's stunt performance and reappear afterwards.
- Errors in geography: In the final shootout in San Vicente, there are trees all around the town and one in the plaza. The real San Vicente, Bolivia is at 4800 meters altitude (over 15,000 ft.), so is well above the tree line.
- Revealing mistakes: During the climactic gun battle, Sundance fires his two six-guns at least 16 times without reloading. Obviously the guns would have to be reloaded after only 12 shots.
- Continuity: In the river, Butch says to Sundance, "You're choking me! You're choking me!" although they're apart at this point. Could be explained by speed-of-sound time lapse.
- Revealing mistakes: When they're eating at Etta's house, before and after Butch shouts, "You probably inherited every penny you got!" you can see Butch's shadow on the set.
- Revealing mistakes: While the second train robbery is taking place, the Pinkertons arrive on the special train. The shot of the special train engine coming to a stop right in front of the camera was obviously filmed with the engine starting close to the camera and backing up, then the shot was run in reverse. Notice the steam is returning to the engine instead of coming out of it.
- Errors in geography: Though the second half of the movie is supposedly set in Bolivia, all the Spanish-speaking actors have Mexican accents.
- Factual errors: In the film, The Sundance Kid claims to have been born in New Jersey. The real Sundance Kid was born in born in Mont Clare, Pennsylvania, although his family did move to Atlantic City at some point.
- Factual errors: At the climactic shootout, the shoulder insignia of the Bolivian army officers are wrong: instead of stripes, the shoulder boards should have six-pointed stars.
- Continuity: After Strother Martin's character is shot, he is seen lying with a branch across his face. In the next scene, the branch is gone.
- Factual errors: The locomotives that pull the trains are completely wrong for the time and place the movie is set. They are class K-28s, which have a very distinct and recognizable appearance. They were not produced until 1923, and were used exclusively by the Denver and Rio Grande Western Railroad on their narrow gauge track in Colorado and New Mexico. (SOURCE: Model Railroader Cyclopedia Volume 1: Steam Locomotives, p. 81.)
- Anachronisms: Percy Garris uses the phrase "Bingo" emphasize a point. "Beano" didn't reach North America until 1929. By the time it was renamed Bingo and made its way to South America it would have been well into the 1930s at least.
- Plot holes: After binding and gagging their sheriff friend, Butch and Sundance don't bother to take any rifles (which they had complained about not having) nor any fresh horses. They ride off double on the same tired mount they rode in on.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Revealing mistakes: SPOILER: After Butch and Sundance get robbed and their boss gets killed by the bandits you can see that the boss is still breathing - his belly keeps rising, and the wrinkles in his shirt change.
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