Continuity mistake: At the end of the film when all the women are dressed up after making clothes out of tablecloths, you can see the Italian woman riding in the front of the wagon. The shot changes and she's riding on the side looking at all the men and smiling. The shot changes again and she's back to the front.
Revealing mistake: When they are crossing the desert, the nut falls off the wheel. After the wheel falls off and falls to the ground, you will see a skinny metal rod retracting behind the main axle.