After "Doc" gets out of the water hole he dived into to escape, he jumps out dripping wet. In the very next scene, he is completely dry.
The Cadillac sustained a damaged fender when the terrorists hit it, but when they took it and arrived at the inn, the fender was undamaged.
When Jan-Michael Vincent breaks the padlock on the cellar storeroom door, he holds his left arm, as if he has injured his left shoulder. But in the next scene, it is his right arm that is in the sling.