Blooper

There appears to be a reoccurring saguaro in different scenes and location. It is a tall saguaro with one arm shooting out on a diagonal on its right (toward the viewer's/camera's left). As saguaros are only native to Arizona's southern Sonoran Desert and the Mexican state of Sonora, and NOT Spain, one has to wonder is this saguaro a Papier-Mache model or a cardboard cutout moved scene to scene and location to location.

At 35:10 Carrincha's horse shows heavy foamy or white sweat around the saddle and reins, possible evidence of a workout or over-exertion. However, immediately prior at 34:56 when Carrincha rode into town and immediately after at 35:14 when Alley Cat (Indio) rides off on the same horse no such foaming is evident.

After Sabata returns the safe, the colonel instructs a lieutenant to "see about his money". The officer who approaches to determine the reward is a captain.

The fake gunfight was supposed to happen at sunrise, but according to the shadows, it was clearly within a couple hours of noon, the sun was overhead and casting a shadow only a few feet long.

When Alley Cat is running across the roof of the ranch house, the shots of the Gatling gun follow him. However, the gun is being tracked by the crew.