After the Apache attack Mano says his horse has been shot but the horse shown is Buck's horse (note the face marking).
The scene begins with Mano hanging upside down on a cross shirtless. @36:28 This is supposed to be before the Trial of Courage begins and yet Mano's back already has lash marks from the whips, when the camera shot shifts to face Mano he has no lash marks on his chest because the trial has not yet begun.
Toward the end, when Buck, Monolito and the girl are riding toward the Chaparral men, as the glare starts to clear, you can see the sun reflecting off a car or truck in the background to the left.