Continuity: In the final duel, when Gary Cooper is shot on his left arm, he grabs the spot where he was supposedly wounded with his right hand, then takes off the hand, and we don't see a wound and his shirt is not torn. In the following shot we see both the wound and the tear in the shirt.
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Mistakes
After the wedding Will Kane lifts up his new wife and seats her on a sideboard. Then, after getting the kiss he asked for, he swirls her around and puts her down on the floor again. In this shot we can only see their upper bodies, but from the way the downward movement pauses while their heads are still almost at level, we can tell that she must have stepped on a stool or something before she touches the ground. See more...
High Noon mistakes
Plot hole: Frank Miller sets fire to the stable Kane is hiding in; when he leaves it, you can see the large column of smoke. But the fire is ignored after that. In an age of wooden buildings and poor fire equipment, that could have burned down the whole town. Even assuming that people wouldn't come out to fight the fire during the gun battle, you'd think that when they all came out at the end, someone would have pointed out they had a major fire to deal with.
Continuity: When Kane tries to persuade Mart Howe to join him, Mart's cigarette and the smoke raising in front of his face disappears between shots.
High Noon trivia
Released during the height of Communist hysteria, the film is a thinly disguised indictment of McCarthyism. The cowardice of the townspeople represents the blacklisting that ruined careers and lives, particularly in Hollywood, all the while supposedly good people were afraid to do the right thing and stand up for those singled out for persecution.