A great deal of dialogue from the book is cut out in this scene. Among the lines that were cut out is Aragorn's response in which he says the Dunedain rangers also keep the lands of Middle-Earth safe, in response to Boromir's boast that Gondor alone holds Mordor at bay. Another change they made is that Aragorn is evasive in this scene about being Isildur's heir, asking Legolas to sit back down. In the book, when it is revealed that he is Isildur's heir, he proclaims that he will return to Minas Tirith. And shortly before the journey begins, Narsil is reforged into Anduril. But in the films that does not happen until Return of the King.