Goofs

When the Indians first charge the garrison, the first shot from the defenders' point of view shows dead Indians already in front of the defenses.

The footage in the opening credits scene of the white horse leading the other horses in a full gallop down to Benedict's ranch is used again during the end credits scene, though played longer.

The clothing of the Revengers became visibly dusty when fighting the Indians at the end, especially their pants, but when they walked away from the jail shed, their clothing was clean.

The Mexican officer eating his lunch refers to "kilometers" but the metric system was not in use in Mexico in the late 1860s.

Inside nurse Reilly's home where John Benedict is recuperating, a very prominent shadow in the shape of a boom mic can be seen moving across the back of his shirt. This means there was a bright studio light above them.