Special care was taken to make sure that the destruction of Sauron's tower of Barad-dur did not resemble the destruction of the World Trade Center. For this reason, it disintegrates from the ground up, and the sound was made from breaking glass, so that it would not sound or look as if it were exploding.
Like Billy Boyd earlier in the film, Viggo Mortensen also composed the tune and sung the part to the song Aragorn sings at his coronation. The translation of the Elvish words runs "Out of the Great Sea to Middle Earth I am come. In this place I will abide, and my heirs, unto the ending of the world." This is, according to the lore of Middle Earth, the same verse Elendil sung when he first arrived in Middle Earth from Numenor.
A scene was cut from the finished film that showed Eowyn (Miranda Otto) stripping away her regular clothes and then dressing herself in the armor of a Rohan warrior.
The runes on the helmet worn by the Mouth of Sauron, when transliterated, say "Lammen Gorthaur". Lammen means voice, and Gorthaur, which is mentioned in the Silmarillion, means Dread Abomination, another title by which Sauron was known. The complete phrase, "Voice of the Dread Abomination", identifies the speaker as the Mouth of Sauron.
To get the idea of perspective in the scene where Denethor drags and throws out Pippin from the burial chamber, Billy Boyd's double was dragged and rolled out. When the double hit him in the back, he popped up.
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