Continuity mistake: When the water wheel rolls away from the camera, just as Jack falls out after hitting his head, the thin part of the axle is missing on the left, though at this angle it should be seen. Both sides of the axle are intact in following shots. Note, when the wheel rolls onto the beach, before it falls over, it is shown at the very same angle as the earlier shot.
Picture added & edited by Super Grover
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