A reflector aligns on Bill during his close-up.
Riders making their falls from their horses can be seen falling on mattresses.
The title is misspelled. It should be spelled with two N's.
During a shootout scene a crew member can be seen walking out from behind a tree and jumping back when he realizes the scene is still ongoing. A short time later, he repeats his error.
Tom's body moves slightly when Ross finds him dead.