The Lord of the Rings: The Fellowship of the Ring (2001)

Other mistake: When the hobbits are hiding under the tree trunk from the Ringwraith in the beginning, you can see space to the left and right of the tree above them. Logically when the Ringwraith walks past the tree you would see it on the right side of the tree first, then on the left, but you don't - it looks like it walks out of the tree instead of behind it. [Confirmed on the commentaries - Elijah Wood asks his fellow actors if anyone spotted the mistake: 'It kind of magically comes out of the tree'. Sean Astin: 'You mean it doesn't pass from the other side?' Wood: 'No, it comes out from the centre.'] (00:51:40)

Trivia: While filming the trilogy, Viggo Mortensen got so into character that, during a conversation with Peter Jackson, Jackson addressed him as "Aragorn" for more than half an hour, and Mortensen didn't even realize it.

Question: When Gandalf is hanging on the edge of the bridge in the mines, what does he say just before he drops? At first I thought he said 'run you fools' but it sounds different every time I hear it.