As the two boys drive away from the boarding house, the lady goes up to the steps, which are in the shade. The next shot, shows the boys farther away from the house which has the steps in full sunshine.
After Cahill is onto his sons' involvement in the bank robbery, we see him and Lightfoot watching the boys fishing. Later, after the boys have traveled awhile in the buckboard, we see the two men watching the boys again. The medium shot of Wayne and Brand reveals that they are sitting on their horses in the very place from which they had been watching the boys fishing.