Revealing mistake: During the cart-pulling scenes in the desert, the use of a stunt double becomes apparent when the usually reed-thin Victoria suddenly gains several pounds and some new muscles in the posterior region. (00:08:00)
Continuity mistake: When the bad guys arrive in Nevermore, they prejudicially assume that Victoria is Manolito's wife. No one disabuses them of this notion, yet John later tells one of them that he was right about Victoria being his wife. (00:30:30)
Continuity mistake: At the end, despite an earlier emphasis on the necessity of wearing one's hat in the desert, John rides out of town without his. Victoria, who wore John's hat when they crossed the desert, isn't wearing it either. And of course, the "lost" hat reappears on John's head in the next episode. (00:39:20)
Plot hole: When Manolito and Victoria jump from the wagon, her hat flies off and falls to the ground. The bandits ride on by, chasing the wagon, after which Mano and Victoria get up and start walking. She later laments losing her hat when they leaped, which makes no sense. Since the bandits and therefore the urgency had passed, there was no reason not to retrieve her hat before they left the area.
Factual error: Despite taking a three-day trek across the blazing Arizona desert with no food, water or provisions (and definitely no knives or razors), neither John nor Manolito grows a beard, or even any stubble. They both arrive in Nevermore perfectly clean shaven.
Continuity mistake: Victoria starts the ill-fated journey wearing culotte-style pants. When they get stranded without food, clothes or other provisions, the pants somehow turn into a skirt.
