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The Dark Tower II: The Drawing of the Three - 2 mistakes
Factual error: Roland comes from the mountains in the east, arrives at the Great Western Sea, and then decides to travel north (Chapter 1, section 3). This means that as he heads north, the eastern mountains should be on his right and the western sea should be on his left. But as he walks, the sea is on his right and the mountains are on his left (Chapter 1, section 4).