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Revealing mistake: In the Escape Ending, as Arthur is rowing his boat, the oar clips through the body of the boat.

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Revealing mistake: After getting the axe, Arthur uses it to cut through some boards blocking a tunnel. If you watch closely on the second swing, his arm is not connected to his body, with his sleeve having disappeared. But the sleeve is there on the third swing.

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Revealing mistake: During the animation of lighting your cigarette, when Arthur brings his left hand up to cover the flame, his thumb passes right through the cigarette.

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