Once Upon a Time in the West (1968)

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)

Cheyenne: Listen, Harmonica, a town built around a railroad - mm mm mm mmm - you could make a fortune, huh? Hundreds of thousands of dollars. Hey, more than that. Thousands of thousands.
Harmonica: They call them "millions."
Cheyenne: "Millions." Hm.

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?