At the beginning, when Matt and Chester go to investigate the fire, Chester lets his horse's reins hang down, Matt leaves his horse's reins over the horse's head. When they rush back to the horses to get their rifles, Matt's horse's reins are also hanging down.
When the old lady is standing by her husband's grave Matt tells her in the spring that hill is a blanket of sunflowers. Sunflowers don't bloom until summer.