Deliberate "mistake": In the second half of the film, Frodo has a scar on his lower right cheek, close to his chin. Many times throughout the rest of the film the scar changes position and size on his right cheek. It also appears on his left cheek in flipped shots (most obviously on the slopes of Mount Doom when Sam is cradling his head).

Continuity: When Gollum accuses Sam of eating the lembas bread, the crumbs on his shoulder don't appear until the shot when Gollum brushes them away.

Revealing: In the first scene in Edoras (the capital city of Rohan). The first pan over Edoras: You can see the pan is shown in reverse, with the smoke going into the chimney and the fire at the end is burning backwards. The flags are fluttering oddly as well.

Continuity: When Gollum drops the lembas from the ridge, you see the leaves it was wrapped in fluttering away, and the wafers fall roughly straight down. However, when Sam finds it later, the lembas is still mostly wrapped in the leaves, with only a few morsels broken off and laying around unwrapped.

Revealing: Legolas sends an arrow directly to Grima atop Orthanc, and as Grima starts to fall back the arrow is quite visibly well below the coat's fur. However, when Grima actually hits the ground, the arrow is now higher up, protruding from the fur. Even Legolas' arrows can't do that!! (Extended Edition.)

Continuity: As Sam lay sleeping, Gollum sprinkles lembas crumbs on Sam's right side. 1st shot, the grey blanket completely covers Sam as Gollum begins to sprinkle it. 2nd shot, the blanket is at Sam's shoulder with a just a bit of cloak and sleeve showing. 3rd shot, the blanket is completely covering Sam's shoulders as the lembas is shown only on the blanket. Then Sam stands and the blanket is now on the ground (as mentioned in another mistake, there are no crumbs at all when he stands). Later, when Gollum accuses Sam in the 'framing' shot, the lembas crumbs are shown on Sam's cloak even though it was the grey blanket Gollum sprinkled it on earlier!!

Visible crew/equipment: In Shelob's lair, when Frodo is caught in the web, in the first close-up while hanging there the camera pans down to his feet. Both ankles are wrapped and have foot supports and the wire cables attached to his ankle straps are visible, especially his left. In the next back shot, as Frodo turns around the wrist/arm support at his right arm, while he holds Sting, is seen too.

Continuity: In the scene where Frodo is stabbed by Shelob (the giant spider) and wrapped in her web, Sam thinks he's dead because he's not moving at all. From Sam's point of view Frodo's eyes are fixed wide open. A cut to a side view of Sam lifting Frodo shows Frodo's eyes shut. The next cut back to the original point of view shows Frodo's eyes back fixed open.

Visible crew/equipment: At the Black Gate, Sauron's forces march towards Aragorn and his army, there are close-ups of Pippin drawing his sword and of Merry taking a deep breath. The next shot is of Orcs running to the right of the screen. As that shot opens, click five-six frames in and TWO crew members are seen between the Orcs on the right of the screen, click a few more times and more crew members, one with a hat, are visible in the middle, between the Orcs.

Visible crew/equipment: When Sauron's forces start to surround Aragorn et al. at the Black Gate, there is a close-up of Éomer glancing towards the right of the screen. The next shot is of Orcs advancing to left of the screen. Fourth frame in, a dark haired crew member is visible behind the Orcs near the center, click some more and again he and others are visible in the background.

Revealing: After the Witch King destroys Gandalf's staff, the wizard and Pippin fall to the ground in the wideshot. In the next close-up, as Pippin (who is behind Gandalf) raises his right leg while he gets up, the white/black sneaker he wears is perfectly visible on Billy Boyd's Hobbit foot!!

Revealing: After Frodo wakes up in Minas Tirith, Merry and Pippin stand in the doorway. Their height reaches the middle of the ornate carving on the door in the close-up, yet in their next wide shot running in, they are considerably lower. When Legolas and Aragorn walk in, also in a close-up, their height is just a bit higher on that ornate carving than the two Hobbits' heights were. Then when Sam stands in the doorway his height also reaches the center of the carving.

Revealing: After Gollum says, "Clever Hobbits, to climb so high!" he jumps onto Frodo and Sam. Gollum then attacks Frodo and when he turns Frodo onto his back, Frodo's shirt is wide open at his neck/chest and the necklace and Ring are GONE. In the next close-up as Gollum chokes Frodo, and the following shots, the necklace is back.

Continuity: In the opening shot as Gandalf stands on the balcony at Minas Tirith the many buildings beside the balcony are shown. When Gandalf says, "If the garrison at Osgiliath falls, the last..." as he continues, "...defense of this city will be gone," the buildings beside the balcony are once again visible. To say that the buildings are completely different in the two shots would be a vast understatement! (This has absolutely nothing to do with camera angles. Extended Edition.)

Continuity: When Theoden is dying, the Witch King says, "Feast on his flesh," and there is no Mumak behind Theoden. As soon as Eowyn appears there is a giant Mumak carcass lying behind Theoden. The beast is seen in a few shots, but in quite a few shots, even the birds-eye views, no Mumak is anywhere near Theoden.

Visible crew/equipment: As Sam carries Frodo on his shoulders, Gollum jumps onto them. When Gollum and Frodo fall down the stairs and then Frodo lies on his back, the black body protector that Frodo wears is first visible at the neck and then under Frodo's front shirt flap that is untucked.

Continuity: At the end, when the four Hobbits are entering Grey Havens, Sam is wearing a yellow vest with brown buttons over a white shirt. The vest can still be seen when Sam and Frodo hug. But when Frodo makes his way onto the ship and turns back to smile at his friends, Sam is no longer wearing the yellow vest. The vest is still not there when the three Hobbits turn to leave Grey Havens. But, when Sam returns home to the Shire and is holding his daughter, he is once again wearing the yellow vest.

Revealing: After Gorbag says, "You touch it, and I'll stick this blade in your gut," Shagrat and Gorbag start to fight. A few shots later there's a close-up of Gorbag who is BALD, he's not wearing his hairpiece/wig in this shot, as he's being pushed towards the right of the screen by Shagrat, just before falling into the hole! (On the Extended Edition DVD, in the Director/Writer commentary, writer Philippa Boyens actually admits that his wig falls off!)

Continuity: Gollum says, "Clever Hobbits, to climb so high!" and leaps onto Frodo and Sam. When he rolls down the steps with Frodo, while Frodo is lying face down, one of Frodo's back suspenders pops off and the button can be seen flying off his back towards the ground. Of course the suspenders are fine in the following shots.

Continuity: When at the Black Gate, the armies of men are surrounded by Orcs, then after Aragorn's "For Frodo" line, they charge across the screen from left to right. When they are running, in a shot where Gandalf is seen on the very right of the screen and 2 Warriors of Rohan with axes are in the front of the shot, you can see through some gaps and there are no Orcs, just an open field. Thousands of Orcs just - disappeared.