Continuity mistake: Not only do the arms on the two large statutes at Amon Hen change, the statutes themselves switch places. When we first see them, the statute of the younger man has a winged helmet and is on the left and the older with the smooth helmet is on the right. In the shot once the boats have gone past, the winged helmet statute is on the right and the smooth helmet statute is on the left.
Continuity mistake: When the Cave Troll stabs Frodo, and then you see Sam close up and yelling "Frodo" He has 2 bloody cuts on his left cheek, and near his lip. But when the Troll is killed, and he slowly approaches Frodo, the cuts are moved further back, so they aren't as noticeable. But when Gandalf 'dies', and you can see Sam close up again, crying, the cuts have vanished all together. (The second timecode is when the cut vanishes all together). (01:59:50 - 02:09:50)
Revealing mistake: In Balin's Tomb, after Merry and Pippin are separated from Frodo when the cave Troll smashes its club on the floor beneath them, the Troll first sniffs around the pillar to Frodo's right (viewer's left) as we see Pippin and Merry standing up, before the Troll comes around to Frodo's right and sniffs again. At the start of the next shot, we actually see Merry and Pippin in full view of their facial expressions, standing at the ready, with their daggers held high, continuing to just stare past the pillar behind Frodo. So, despite the fact that the huge Troll is appearing directly in front of them, to Frodo's right once again (before it roars), Merry and Pippin don't even glance in its direction. (00:31:35)