The costume department filled Bilbo's vest pockets with small stones so that the fabric would sag and look 'used' rather than new.

Gil-Galad shows up in the movie during the prologue. He has armor like all the other elves, but he is wearing a blue cloak. He is the one who pins an orc to the ground with a spear.

John Rhys-Davies developed an allergic reaction to his makeup.

When Legolas is on the Troll, only some shots of the lower part of his body are CG, the rest of him is real. Whereas, when Merry and Pippin are seen on the Troll, they are entirely CG. Commentaries, extended DVD.

It is rather interesting that the German dubbed version of FOTR follows Tolkien's guidelines for pronunciation more closely than the original English version. In the Appendices to the novel (Appendix F, 'On Translation') Tolkien states that Sam's name is not of Hebraic origin but short for 'Samwise' (an Anglo-Saxon word, Tolkien being a lecturer in Anglo-Saxon and Old English) and therefore not to be pronounced similarly to the abbreviation for 'Samuel'. Instead the name would have been pronounced [sahm] (the 'a' like in British English 'fast'). Another example is with place names such as 'Isengard' ('Isen' rhyming with 'treason').

Christopher Lee (Saruman) reads "The Lord of the Rings" once a year, and is the only cast member to have actually met J.R.R. Tolkien.

When the trailer was released on the Internet on April 7, 2001, it was downloaded 1.6 million times in the first 24 hours.

In the scene where Bilbo drops the Ring on the floor of Bag End and it thuds, a magnetic floor was used so the Ring wouldn't bounce.

At Bilbo's party, when he is giving his speech, the cake actually got set on fire (this is pointed out in the extended version) but as Ian Holm carried on acting, Peter Jackson decided to leave it in.

John Rhys-Davies (Gimli) is actually the tallest member of the Fellowship (Christopher Lee's the tallest member of the cast).

In the scene where Arwen is taking Frodo to Rivendell and they are being chased by the Ringwraiths, there's a part when she gets a cut on her cheek from a tree branch. In the movie, when she gets the cut, you can see the that it's on her right cheek. But, if you look on the DVD or VHS cover, it is on her left cheek. I'm counting this as trivia rather than a mistake, because it's not a mistake within the movie, but it's worth a look.

During Bilbo's party, right after Merry and Pippin set off the dragon rocket, we see Pippin's blackened face, then Merry's blackened face, then a shot of four Hobbit guests looking up at the sky, three males and one female - the female Hobbit is on the right side of the screen. I may be completely wrong, but I think she might have been played by Philippa Boyens, one of the movie's screenwriters. There are some shots of Boyens on the behind-the-scenes disc, especially in the feature called "A Passage to Middle Earth," and she and this Hobbit sure look alike to me.

In the scene near the end when the Fellowship is canoeing down the river, Legolas and Gimli's boat capsized because of a crew member trying to prevent them from floating downstream. Gimli started to sink because of the chain mail, and rescue boats came swarming out to save them.

Andy Serkis, who plays Gollum, also voices the Ringwraith who says, "Shire...Baggins" to the hobbit outside Hobbiton.

In the scene right after Bilbo leaves, Gandalf is sitting by the fire thinking to himself about how Bilbo acted when asked to give the ring to Frodo, calling it his "precious" and all. While Gandalf is thinking, he mutters, "Riddles in the Dark." "Riddles in the Dark" is actually the name of the chapter in "The Hobbit" where Bilbo finds the ring.

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.

After asking about second breakfast, Pippin is hit in the head with an apple by Aragorn. The apple was really thrown by Viggo Mortensen, and he had to throw it 15 previous times before he hit the spot Peter Jackson wanted.

Two of the children Bilbo is telling his troll story to are Peter Jackson and Fran Walsh's children.

In the scene where Merry and Pippin light the firework, Billy Boyd was so shocked by the firework going off when it was being filmed that he actually let out the high pitched shriek that is heard when the tent goes up. In some of the behind the scenes stuff, Dominic Monaghan makes fun of Billy by calling him 'a slightly feminine character', while poor Billy tries to defend himself.

The scream of the Nazgul (Ringwraiths) is actually Fran Walsh, co-writer with Philippa Boyens and Peter Jackson (director) on the film.