Other mistake: At the very end, Mr. Hanson is seen walking toward the church. Because of his stroke, he's slow and unsteady. We see several close-ups of his feet, showing how he's struggling. Two of those shots are the same footage. It's obvious, because you see that he drags his foot over a small stick in the road and stumbles - and in both shots, it is exactly the same.
Other mistake: Charles has just brought Adam a letter to the site of the blind school rebuild. When Adam is told that his father died, he and Mary walk away from Charles. The terrain was very uneven. Being blind they realistically wouldn't be able to navigate it without stumbling.
Other mistake: Charles can barely get up from his bed because of broken ribs, and it's totally impossible to breathe well, let alone moving sacks of grain. But in the end when the neighbors help with the sacks he's walking OK, as if he hadn't just fallen down from the top of the pile of sacks with broken ribs.