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- Extended opening, in which the hobbits scale a cliff face using the rope Galadriel gave Sam, including a better build-up to the arrival of Gollum.
- More friction between the Uruk-Hai and the Orcs as they transport Merry and Pippin back to Isengard, which better sets up the fight over food that takes place later.
- More scenes of Saruman breeding his army, creating better pacing as the invasion of Rohan begins
- Terrific scene in which Eomer finds the body of Theodred, Theodens son.
- Additional scenes with Merry and Pippin, including extensions to existing Treebeard scenes and the Ent Draught sequence, in which the hobbits grow. In another scene, Treebeards soporific poetry works its magic.
- Theodreds funeral scene, with Eowyn singing a lament.
- A wonderful introduction to Aragorns horse Brego, who we learn was Theodreds horse. Aragorn requests Brego be set free, which places his later rescue in better context.
- Additional scenes between Eowyn and Aragorn, including one in which he attempts to eat a bowl of evil-looking stew.
- More scenes between Gandalf, Aragorn, Legolas and Gimli, which expand upon the films politics (including the union between the two towers Gandalf scene from the trailer, though that line is missing from what I can remember).
- More of Sarumans musings, setting up themes that will be explored in The Return of the King.
- Flashback to the circumstances surrounding Boromir being sent to Rivendell for the Council of Elrond, taking place during the re-taking of Osgiliath by the Gondorian army. This sequence briefly introduces John Noble as Denethor, a major character in The Return of the King. I was worried this sequence would seem like an indulgence, but its difficult to imagine the film without it; not only is the character of Faramir, much maligned by fans of the book, given added depth, so too is Boromir enriched by this addition.
- Just before the Ents storming of Isengard, the Huorns mobilise and leave to attend to business elsewhere; they reappear at Helms Deep to kill the Uruk-Hai as they flee.
- New ending, with Merry and Pippin finding a larder at Isengard, including two barrels of pipe-weed; a hilarious scene in which Gimli and Legolas compare their scores after the battle of Helms Deep; Frodo, Sam and Gollum are shown the way out of Osgiliath by Faramir, who threatens Gollum; theres even a brief moment in which Sam and Gollum appear to make peace.
- Along with all these major additions, many more scenes are subtly extended to give more information or reinforce themes already present.
