Moonbeam/YMMV

Cargo Ship: Feather Down and her bed.
Hilarious in Hindsight: Pinkie Pie sing invites Luna to her Welcoming Party and mentions she liked doing it so much she'll do it for her next party, a few weeks later on the show, she does.
I Knew It!: Some time after the story ended, Lauren Faust on her blog talks about how each pony has a magical power, Earth Ponies' is very similar to "Earth Pony Magic".
Jerkass Woobie: Nightmare Moon, sure she's a mean spirit jerk who insults everyone at least five times but by the end she's such a bitter broken wreck you can't help but feel sorry for her.
The Woobie: Celestia ends up being the woobie of the royal sisters wend its learn she spent months on a Plan just to hang out with the mane six, the closest things she has to friends.