When Crusoe rides out from his father's house, he first muffles the horse's hoofs. However, when he passes through the gate, the horse's hoofs are not muffled anymore.
When Friday shoots the pirate with an arrow, the arrow hits him in the back. When the pirate's dead body touches the ground, however, the arrow has pierced his neck.
When Robinson throws the pirate's body overboard you can see the pirate pushing off the side of the boat and swimming once under the water.
Robinson Crusoe says that Anne Bonny was hanged on November 17, 1674. However, Anne Bonny was not born until 1697 or 1698.