In the movie, the sacrificed slaves reuniting with their loved ones, who dive over the side of the ship to swim out and meet them.
In the book, the quiet moment shared by Edmund and Eustace when Edmund is the first to encounter Eustace after Aslan returns him to his human form - in particular, Eustace's attempt at apologizing for his behavior up to that point, and Edmund's reply:
"That's all right. Between ourselves, you haven't been as bad as I was on my first trip to Narnia. You were only an ass, but I was a traitor."
When the transformation of Eustace becomes known to the crew, Caspian and company are far more concerned with how inconvenient this is for them than with how Eustace must be feeling... except Reepicheep. The mouse spends his evenings keeping the unfortunate dragon company and telling him stories of other people who had suffered enchantments only to later have them removed. "It was meant well, and Eustace never forgot it."
The friendship that grows between Eustace and Reepicheep after the former is transformed into a dragon.
Lucy's friendship with Gael. Especially when Gael says "When I grow up, I want to be just like you," and Lucy, having worked through her own crisis of self-esteem (from comparing herself unfavorably to her older sister) replies "When you grow up, you should be just like you."
This simple line from Eustace at the end of the film. He and the other two hated each other at the start. Lucy especially says "how will we survive?" when they find out how long they'll have to stay. But going to Narnia helped bond them all together.
"We spoke of Narnia a lot in the days that followed. And when the war ended and my cousins went home, I missed them".