Continuity: At the end of the movie when Cheyenne is shaving, while Harmonica and Frank are having their shoot-out, he cuts himself at the sound of the gunshots. When Jill tells him that he is a handsome man the cut is gone.

Continuity: During the last flashback that reveals Harmonica's issue with Frank and the significance of the harmonica, the harmonica in the boy's mouth is sometimes dented, sometimes not.

Factual error: It seems unlikely that the bullet hole in Harmonica's jacket should have burned edges - he was shot at a distance of more than ten metres.

Revealing: When Jill get's off the cart at the post station look how the light falls on the cart with the luggage and the rock in the background. It obviously comes from opposite directions.

Other: When Jill tries to leave Sweetwater in the morning after Cheyenne's visit, she runs into Harmonica. He has a very nasty, coarsely stitched injury in his cheek that is not accounted for, and for which there was no time to be received, stitched, and the stitches removed again.

Continuity: After Jill's arrival at the train station she leaves by cart. The way the luggage is piled on back changes totally when they go through Monument Valley. There are reasons to believe that it's a different cart as also the horses seem to change (check the mane which changes colors and sometimes falls to the left, sometimes to the right).

Factual error: When Harmonica climbs down the ladder, only to meet Frank at the other end of a '45, we see that the ladder is electro-welded to the wagon and the steps are also electro-welded to the legs of the ladder - rather lousy welding seams, too! The movie takes place around 1870. Electro-welding started during the '90s, but the method got practicable only in the 1920s – and began to be commonly used in the late '30s when the great navies (except for the Royal Navy) started to use the method for their first-line ships. The great leap forward came during WW2, when Liberty ships and many other vessels were electro-welded.

Revealing: Jack Elam gets bothered by a fly crawling over his face (nice stunt, actually). When the fly moves over the bench, just before he catches it with the muzzle of his gun, look at the hind legs. You'll notice that the fly is dead.

Continuity: In the scene where Cheyenne shoots a man through his boot the curtains at the top the window are happily moving in the wind, but when we see them from outside they are almost still.

Revealing: In the morning after Cheyenne's visit Jill attempts to leave Sweetwater for the second time. She carries a lot of luggage to the stable, and it's very obvious that it's all empty.

Continuity: On the way to Sweetwater the cart goes through Monument Valley. There, the very long shadows of the cart and the rocks don't match the time Jill has left the station (some time after 10). A bit later, when they pass the construction site, the shadows are short and more fitting for the time of the day again.

Continuity: The whole scene in the post station takes about 12 minutes. During this time the bartender finishes his cigar almost completely, a task that takes at least 45 minutes if you smoke fast. In the very last shot the cigar is again much longer but half hidden in the hand, apparently to make it look shorter.

Continuity: The bullet hole in Harmonica's jacket changes size, shape, and degree of bloodiness during the scene at the post station.

Continuity: During the shoot-out between Harmonica and Frank lengths and directions of both opponents' shadows keep changing, e.g. when Frank drops his jacket.

Continuity: When Frank's henchmen wait for Harmonica at the train station it's very windy. For example, you see the wires of the telegraph machine moving, and a string that's dangling in the window behind it is swaying wildly. Only in two shots, when the station agent gets locked up, the wires and the string are absolutely still, to start moving as before in the next shot. Desert wind wouldn't stop completely just for a few seconds.

Continuity: When Jill attempts to leave Sweetwater for the first time her hair is combed out of her forehead, enhancing its striking beauty. When she opens the door, only to face Cheyenne and his men, the wind blows her hair even further back, but when the camera cuts to outside the wind is coming from behind, blowing her hair over her face.

Continuity: When Harmonica shows up at Sweetwater, the bullet hole in his jacket that he received at the station is gone (gone, not mended.).

Revealing: When Jill offers herself to Cheyenne she puts down the kettle on the table so hard that the lid falls off. If you look closely (slow motion helps) you see the lid dangling by the knob between her fingers before she puts the kettle down.

Factual error: At the end of the post station scene Cheyenne advises Harmonica to "watch those false notes". Harmonica anwers this with a discordant chord that could not be produced on a harmonica like his.

Continuity: When Jill arrives at the McBain killing scene a close-up shows her looking in shock at the corpses. There are long, untidy strands of hair hanging down from both temples. When she gets off the cart, only the hair on the right side is loose.