Trivia: The original cut ran four and a half hours.
Trivia: Elijah Wood (Frodo) filmed his audition out of the casting office. He memorized the script there (he wasn't allowed to remove it), bought a Hobbit-ish costume, and had a friend of his film his audition in the Hollywood Hills. Jackson chose him because he looked like what a Hobbit should look like - in a costume with no shoes, sitting on the side of a hill, giving lines like he should be giving them.
Trivia: Sean Bean used to play a Napoleonic-era army officer on TV known as Richard Sharpe. Ever since then, he has made subtle comments about Sharpe in his movie appearances. The one in this is in Rivendell, when he handles the broken sword of Elendil and accidentally cuts himself. He whispers, "Still sharp."
Trivia: Laurence Makoare's full costume and make-up for the role of Lurtz took eleven hours to apply.
Trivia: After being cast as Peregrin Took, Billy Boyd was advised by Peter Jackson to tone down his Scottish accent because it stood out from the other hobbits' English accents, so during rehearsals he used a Gloucestershire accent. However, PJ and crew decided that Pippin's lines sounded funnier in his normal accent, so he returned to it.
Trivia: When the trailer was released on the Internet on April 7, 2001, it was downloaded 1.6 million times in the first 24 hours.
Trivia: There's a part in the book, 'The Fellowship of the Ring', just after Frodo has been grabbed by the Watcher in the water outside the gates of Moria. Gandalf thinks, but does not say, that 'whatever it was that dwelt in the lake, it had seized on Frodo first among all the Company' ie. the implication being that the ring draws attack and evil from all around. This happens in the film too - the first Ringwraith is able to separate Frodo from the other three hobbits, when they're running for the Bucklebury Ferry, the Watcher grabs him, as in the book, and even the Cave Troll singles him out.
Trivia: You may notice that in every shot of the Hobbits after the Shire scenes, they are always walking from the left side of the shot to the right. This was done to give the impression that they are journeying eastward towards Mount Doom.
Trivia: When the Fellowship is taking the path of Caradhras, there is a shot of Saruman shouting on the top of Orthanc, and the camera swoops around closer to him. If you slow it down or pause it you can see a huge white bandage on one of the fingers of his left hand. Christopher Lee (Saruman) had hurt his finger shutting it in a door. This is confirmed by the DVD audio commentary.
Trivia: Towards the end of the film, Sam runs to catch up with Frodo when he's in the boat, but during one of the takes, Sean Astin stepped on a piece of glass in the water, that cut through his fake hobbit foot. Astin had to be taken to the hospital for stitches via helicopter. This was all caught on tape and can be seen on the appendices.
Trivia: Christopher Lee, who plays Saruman, recalls an incident which left him rather baffled. A fan walked up to him and asked if Dracula [one of Lee's well-known cinematic characters] and Saruman were to fight each other, who would win? Lee was flabbergasted. He said, 'I just looked at this man. What a ridiculous thing to say. I mean, really, it was absolutely idiotic.'
Trivia: On the 2 disc DVD, theatrical version of the movie, when the fellowship is leaving Lórien in the boats, the entire time Frodo is sitting at the front of the boat with Sam behind him, and Aragorn behind Sam. But when they pass the Argonath, Aragorn taps Frodo on the shoulder. He is sitting right in front of him and Sam is in the front of the boat. However, this is corrected in the extended version because there is a scene right before they see the Argonath where they get out of the boats. They spend the night on shore, so it is actually a different day from when they left Lórien to when they see the Argonath. So it is assumed that Sam and Frodo just switched places the next day.