Revealing mistakes: At the beach, a man carves Anna Muir's name into a post buried in the shore and much is made of the fact that every ship passing by will see it forever. But the side of the post he carves her name in faces inland, meaning no one on a passing ship will ever see it. The name wasn't carved into both sides, either - Anna's mother Mrs. Muir has to walk around to inland side to see it.
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