Continuity: During Frodo and Sam's final scene in Osgiliath, you can clearly see that the chain Frodo is wearing has gotten much longer. In several shots while Frodo is on the ground, the chain hangs down below the shot, so you cannot see the Ring.

Audio problem: When Sam, Frodo, and Gollum are in the forest of Ithilien, when Sam says "Can't you hear yourself, don't you know who you sound like?" the shots change and you can see Sam mouthing the words again.

Continuity: As Theoden draws his sword before the cavalry charge from the hall, there is a rider to the right of Legolas at the edge of the screen. When it changes to a wider shot, the horse and rider are no longer there, and there is a clear space where they were standing.

Revealing: Frodo, Sam, Faramir and Gollum are at the sewer in Osgiliath. when Faramir asks, "Cirith Ungol?" and then grabs Gollum's neck. Frodo and Sam watch as Gollum is grabbed, but their eyes do not follow Gollum as Faramir grabs him, their eyes remain focused on the ground to their left. The shot of Faramir and the shot of Frodo and Sam were edited together, with Gollum added later.

Continuity: When Saruman and Wormtongue look down from Orthanc at the Uruk-hai army, it is spread out across the plain in front of the tower. What happened to the vast caverns which had been dug into the ground? Some are shown off to the left of shot, but the landscape had earlier been shown as much more pitted in other scenes.

Revealing: At the Battle of Helm's Deep, just after Aragorn slices the leg off the Uruk and just before Gimli slides down between the legs of another Uruk and smashes his axe into his chest, look carefully at the Elf on the left side of the screen. He arches his bow and fires, followed by a specific shooting bow sound effect, but there is no arrow.

Continuity: During the Warg battle, just after Gimli falls off Arod, the Warg across the field lifts his face and spots Gimli. In the two close-up shots, directly behind the Warg, on his right, there are two arrows sticking up out of a dead body. However, in the wide shot that follows, there is no body with two arrows protruding, anywhere behind him. It is not the bodies to his side.

Revealing: At the battle of Helm's Deep, Theoden, Aragorn, Legolas and the rest ride out of the Keep to meet the enemy, watch as the first men out of the gate kill all the Uruks on the bridge, yet the men riding behind them continue to hack and slash away at thin air.

Revealing: Gimli is lying with his face under the water, after jumping off the Deeping Wall and landing on the Uruk-hai. In the close-up, the right arm that grabs Gimli's shoulder to help him out of the water is Legolas' right arm. Yet, in the wide shot, suddenly it is Aragorn helping Gimli to his feet, not Legolas!

Revealing: In Osgiliath, when Sam and Frodo are falling down the stone steps, both of their knee pads are revealed because their knickers ride up at the knees during their fall.

Continuity: As Faramir holds the Horn of Gondor, the rope is attached to metal loops on the smaller half of the horn - without the mouthpiece. However, in FotR, when Boromir is hit with the third arrow and the Horn of Gondor is cloven in two, the rope is attached to the metal loops on the half with the long mouthpiece!! (There are only two metal loops and they are permanently affixed.)

Revealing: At Helm's Deep, in the 1st close-up, Gimli says, "You could have picked a better spot," and two particular Elves stand at his left. In the next wide shot as Aragorn approaches, the Elves to the left of Gimli are different Elves than in the previous shot. One of those Elves from the 2nd shot is seen close-up when Aragorn walks away. Also, the second row of Elves is much closer to the first row of Elves in the 1st shot.

Deliberate "mistake": In the director's commentary, it is explained that the scene of Aragorn arriving at Helm's Deep was filmed early in the shoot, before it was decided that he would have lost the Evenstar. Consequently it had to be painted out. However, when Aragorn turns to leave Gimli a flash of silver from the jewel at his chest still remains.

Deliberate "mistake": In the scene after the Helm's Deep battle, when Aragorn meets Eowyn, the earlier footage of Aragorn's return to Helm's Deep is used. He has the wound on his shoulder and is dressed like he was during the 'falling' episode. The background (people in the fortress walking calmly) also indicates that this takes place before the battle. This scene should immediately follow the one where Aragorn is greeted by Gimli ("you are the most reckless man I ever knew"). Confirmed on cast commentary, extended DVD.

Deliberate "mistake": During the Warg attack, Aragorn jumps onto a moving Warg and in a close-up, he headbutts the Orc rider. In the next shot, as they're riding, they pass a Rohan rider on a white horse. In the background there are dead bodies strewn on the hill to their right, as they're approaching a huge bush also to their right. As they continue moving, there are multiple shots, including Aragorn falling and stabbing the Orc. In the shot just after the Orc rips off the Evenstar, the Orc falls off the Warg and it is the very same background plate as before, as they pass that huge bush to their right. These two pieces of footage were obviously one sequence that was split and other shots were inserted in between them.

Revealing: In the scene where the Ents are releasing the river, on the bottom left hand side, you can see an Orc chopping at an Ent. However, when the Ent moves, the Orc is still chopping the same place.

Continuity: The bodies and rocks behind Gimli change positions, between shots. When Gimli says the words, "That's not bad for a pointy-eared Elvish Princeling," there is a rock right behind Gimli to his right. In his close-up it's not there. Yet, when the camera does another close-up, when he reacts to the arrow between his legs, the rock is to his right again. When Gimli says the words, "I myself am sitting pretty on forty three," behind him to his right, a Rohan turns over the body of an Uruk onto its back. When Gimli says the words, "He was already dead," that Uruk hasn't been turned over.

Continuity: In the scene where Gimli is about to tell Eowyn that Aragorn fell, Gimli's axe has Orc blood on it, in the next shot there is no blood. There's not enough time for him to have cleaned his axe.

Continuity: Éowyn and many of the refugees are shown as they see Helm's Deep in the distance. In the first wide shot, Éothain and Freda are riding on the horse and a particular rock formation is seen way in the distance. They keep riding towards Helm's Deep, which we see in the next shot. In the children's next close-up, they are now right in front of that rock formation that was shown in the earlier shot. This is not due to zooming. The two pieces of footage were switched, so as to have their close-up seen last.

Continuity: In this shot, Pippin grabs some apples and a green ear of corn, then he puts it all into his left hand, starts to turn around and with his empty right hand he reaches for a floating cauliflower. The camera angle changes, and in the next shot, we see him holding an apple and corn in the right hand and another apple in his left hand. Floating to the right of him is no longer a cauliflower, but a green bottle. Extended DVD.