Factual error: Throughout the movie, characters strike matches to light lamps. While "strike anywhere" matches had been invented by this time and were quite the rage in Europe (despite an alarming tendency to explode due to the volatile chemicals used), they were an unknown commodity on the American frontier until well after the turn of the century.
Continuity mistake: When John startles Clem, she drops all three of her packages to the floor. In the next shot, one is back on the table even before she bends to retrieve them. She then puts the flat parcel on top of the two rectangular ones - but one shot later, it has moved itself off the stack and onto the table.