Revealing mistake: After Sam dives between the Troll's legs and tries to crawl away, Aragorn and Boromir pull the chain that's around the Troll's neck to get him away from Sam. In the next two shots of Sam, his left wrist has an ace bandage wrapped around it - it's at his white shirt cuff. Notice the bar on his palm between his thumb and index finger. He did not have the bandage in earlier shots, nor does he have it in later shots.
Picture added & edited by Super Grover
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