Revealing mistake: When Gollum brings the two rabbits, he drops them onto Frodo's lap, and Frodo is leaning up against one of the broken stone structures. After Frodo opens his eyes, the stone structure behind him vibrates when he moves a couple of times. This structure should be way too heavy to jiggle when Frodo moves. (01:41:05)
Revealing mistake: When Aragorn tracks Merry and Pippin near the beginning of the movie, after meeting Eomer, the trio stops at the border of Fangorn forest and you can see in this closeup that it's the scale double Brett portraying Gimli, not John Rhys-Davies.
Revealing mistake: When Aragorn saves Gimli from the warg, the spear he throws is CG. He barely tosses the thing with little more thrust than his forearm can allow, and it pierces straight through the warg's tough hide. (00:12:10)
Revealing mistake: When Faramir has his sword tip around the chain holding the ring, the blade Faramir is holding is a dead blade i.e. it has no sharp edge. (00:42:15)
Revealing mistake: In the aerial shot approaching the Horse Kings village the banners are flapping the wrong way and the chimney smoke is going into the chimney, instead of out, revealing that it was shown in reverse.
Suggested correction: Which scene is that? I couldn't find it anywhere.
It's the scene where Eowyn exits the door angrily and walks towards the fire circle thinking, in the trailer she's on the left of the screen but in the movie she's on the right.
Revealing mistake: Gollum is leading Frodo and Sam through the Dead Marshes, towards Mordor. When Gollum runs across the first bit of the swamp, he treads into water; but the water does not move, nor does Gollum act like he has tread in water.
Revealing mistake: As Aragorn, Legolas and Gimli gear up for the battle of Helm's Deep in the Keep, Gimli puts on chainmail. After he says it's too tight in the chest, you see a back shot of Gimli standing facing Aragorn and Legolas. This man is obviously a scale double, as the body and posture are wrong.
Revealing mistake: When Theoden says, "They will break upon this fortress like water on rock," the camera is in a crane shot which slowly creeps up, becoming a medium close-up of Aragorn. As the camera flies over the front wall of Helm's Deep in the shot where Theoden delivers his line, look down into the deepest level of the castle towards the left of the screen. Rohan citizens are bustling and moving. If you watch closely, you can see the lowest level of the castle jump and shake in the shot. This is because that lowest level wasn't there in reality and it was added in the computer. (Probably can be seen only in the Widescreen version).
