Those Little, Unimportant, and Unknown parts that we love...

[Corwyn Celesil]

I love many of the chapter titles. Have you noticed that the first chapter of LotR, "A Long-Expected Party," harkens back to the first chapter of The Hobbit, "An Unexpected Party"? Also Chapter 6 of Book VI of RotK, "Many Partings," is like Chapter 1 of Book II of FotR, "Many Meetings."
Tolkien does things like that all through the books. Three times, once in each of the books, he mentions something about Aragorn having a star on his head. In FotR, in "Fog on the Barrow-downs," the hobbits

had a vision as it were of a great expanse of years behind them, like a vast shadowy plain over which there strode shapes of Men, tall and grim with bright swords, and last came one with a star on his brow.

In TTT, in "The Riders of Rohan,"

For a moment it seemed to Legolas that a white flame flickered on the brows of Aragorn like a shining crown.

And in RotK, in "The Steward and the King," when Aragorn is crowned,

his head was bare save for a star upon his forehead, bound by a slender fillet of silver.

I suppose this is a rather important point rather than being insignificant, but the mentions are so fleeting that I wonder how many people have noticed their parallelisms?