Aragorn: Gentlemen! We do not stop 'til nightfall.
Pippin: But what about breakfast?
Aragorn: You've already had it.
Pippin: We've had one, yes. But what about second breakfast?
[Aragorn stares at him, then walks off.]
Merry: Don't think he knows about second breakfast, Pip.
Pippin: What about elevenses? Luncheon? Afternoon tea? Dinner? Supper? He knows about them, doesn't he?
Merry: I wouldn't count on it.
As Boromir and Aragorn talk right before Boromir dies, you can see Boromir's right hand gripping Aragorn's left shoulder in the shot from behind Aragorn's right shoulder, but when the camera view changes to Boromir's perspective, looking up at Aragorn, his hand is not there. The scene goes back and forth between these two views several times.
According to the Guinness Book of Records, the Lord of the Rings holds the record for the greatest number of false feet used in one movie: 60,000.