Avatar: The Last Airbender - The Promise/Heartwarming

"Ho-Tun: Sifu Toph, you're the first person to believe that we can become more than what we are."
 * Every instance of Aang and Katara calling each other "sweetie". Ooginess aside, it really shows how far they've come since their first meeting.
 * Also the subtle nod to their Relationship Upgrade with Aang's new glider--which he and Katara fly on together--colored Water Tribe blue.
 * Sokka managed to find Boomerang again, after losing him during the airship battle!
 * What about Space Sword?
 * Part 2 suggests that it hasn't made its way back to him.
 * This moment from Part 2 was so heartwarming, it made Toph tear up: