Continuity mistake: When Ben heard the gunshots and mounts his horse and rides towards the gunshots he is not carrying a rifle nor is there one on his horse, but when he returns to The Way Station being chased by the Indians he is carrying a rifle.
Continuity mistake: The schoolhouse has two windows, one on either side of the door. From inside, the view out the windows is of a grove of pine trees. This is obviously a painted backdrop. When the students exit the schoolroom, the nearest tree is a large white-limbed tree with no leaves.