foreshadowing and echoing

In another thread, I made this observation about the coronation. In TTT, when Aragorn returns from the dead, Legolas gives him back the 'Evenstar' necklace and Aragorn says, 'Hallon le' - 'Thank you'. In FOTR, at the coronation, Aragorn tells Legolas, 'Hallon le' and Legolas - with a look - directs Aragorn's gaze toward the other Elves... and there is the 'Evenstar' in person. Way back in the day, when I'd just seen ROTK, I realized I was finding lots of similar moments and initiated a conversation (on another forum) where we came up with quite list. Below are a few. Feel free to add your own or comment/discuss as suits you.

When Déagol opens his hand to display the Ring in the mud. This is an echo of Bilbo opening his hand full of mud and Ring in the Misty Mountain.

The fight between Sméagol and Déagol is echoed later by the fight between Gollum and Frodo in Shelob's cave. In both cases each is fighting the other over possession of the Ring and choking is involved. In the first fight, Sméagol kills Déagol. In the second, Gollum begs mercy and Frodo gives it.

Many see Denethor and Théoden as a pair... their situations are similar but their choices and fate differ. There is a scene with Denethor where we see blood-red wine(?) seeping out of his mouth. The shot suggests gluttony and by inference, indifference to his son. Later we see red blood seeping out of Théoden's mouth as he lies dying under Snowmane. This is a symbol of his heroism in the face of certain defeat.

And when the four hobbits come back to the Shire, the hobbit that was sweeping his front walk when Gandalf arrived for Bilbo’s party is again sweeping his walk, but this time he is making faces at the four hobbits as they ride by.

In Mount Doom, Frodo is hanging on to the cliff and Sam reaches down to pull him up. The hand clasping is reminiscent of the scene at the end of FOTR when Frodo is reaching into the river to save Sam. The same desperate hand clasping - they saved each other in so many ways.

Gollum means to eat a worm in the TTT EE version (at Dead Marshes?) and Sméagol is dangling a worm at the beginning of ROTK.

Frodo holds Sting to Gollum's throat at the beginning of TTT and Frodo holds Sting to Sam's throat at the end of TTT. (An indication of the swing of sympathies/hostilities that we will see develop in ROTK?)

When Frodo panics because he has lost Gollum in Shelob's lair, you hear Gollum sing "why do you cry?" just as he did to himself when he is captured and beaten by Faramir's men in TT.

During Théoden's death scene, he opens his eyes to find Éowyn and says "I know your face." just as he does in TT when Gandalf delivers Théoden from Saruman's spell.

In ROTK, Aragorn tells the dead army to "Be at peace" when he releases them, just as he told Boromir the same in FOTR. Both Boromir and the dead regained their honor by fighting for the cause of good.

While the hobbits are climbing up past Minas Morgul, Gollum urges them on, saying "Come, master, come to Sméagol!" -- the exact inverse of what Frodo said to Gollum at the Forbidden Pool.