When they're driving through the desert right after trading for the pickup truck, both Margo and Jeff are noticeably perspiring in closeups, but their faces are dry in two shots.
When Claude Rains is making Robert Mitchum a drink he sets down the rose, picks up the drink with his left hand and transfers the drink to his right hand. The scene cuts to a wider shot and Rains' left hand is in his pocket.
The level and color of the drink in the glass Claude Rains is holding changes.
At one point while on the run, Jeff Cameron (Robert Mitchum) asks Margo Lannington (Faith Domergue) what road they're on, and without her ever mentioning it, he states how Route 152 goes to Fresno and other points beyond.