Deliberate mistake: The hiding of the fatal wound of Cheyenne was completely unrealistic. He couldn't return from the train on horseback and hide the wound till the end. The fact of having a fatal wound was not fitting the last Jill-Cheyenne conversation scene, but they still wanted to force it into the story as a symbol of the dying of the Old West.
Once Upon a Time in the West (1968)
1 deliberate mistake
Directed by: Sergio Leone
Starring: Charles Bronson, Henry Fonda, Jason Robards, Claudia Cardinale
Continuity mistake: 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. (02:22:25)
Trivia: While Morton's private train plays a key role in the movie, and the train moves several times, the train's engineer and fireman are never shown, nor is any reference ever made to them.
Question: At first it seemed Cheyenne didn't know harmonica man, but later in the movie they help one another once to get the $5,000 from Cheyenne's bounty. Then Cheyenne rescues harmonica man from the train. And finally Cheyenne didn't want harmonica man to see him die they were leaving together I just think they knew each other and this was planned?
Answer: They formed an alliance, Cheyenne wanted to know why he was being framed for the massacre of an entire family by Henry Fonda and Harmonica seemed to know everything.