Continuity mistake: After the chase in the potato truck, the Angels are missing the handcuffs around their wrists. But they can't have removed them: they didn't have a key, they only removed the cuffs from the connecting chains, and after they cut off the chains, they were in the truck until they pulled over.
Continuity mistake: After the Angels escape the Sheriff's car, they run to a barn. They spot a truck with the back loaded above the cab, with potato boxes. They steal the truck and when they pull out from beside the barn, the truck only has half the amount of boxes. No boxes can be seen higher than the sides of the truck. They don't pull out quick enough for the boxes to fall off.
Continuity mistake: During the scene where the Angels are being driven out into the desert to be killed, they are chained together. They reach over the front seat and choke the Sheriff and Deputy. In the close up shot, they pull their heads back with the chains. The Sheriff's hands go up in the air. In the long shot, the person driving and passenger are sitting normally and steering the vehicle.