Continuity mistake: When Will first sees the hammer it's lying on top of the anvil almost parallel with it. Right before Jack says, "You know what you're doing, I'll give you that," as Will sticks his sword towards Jack's legs, the hammer's seen to Jack's right, perpendicular to the anvil. In the next shot, when Jack actually says those words, the hammer's lying parallel to the anvil again. Jack says, "If I step here," and the hammer's perpendicular to the anvil again. Then in the next few shots, once again the hammer's parallel to the anvil. Even in the 'parallel' shots, the hammer's lying a bit differently.
Picture added by Super Grover
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