In "Roll Around The Clock", Bright Eyes and Lancer finally admitting their feelings to each other, and later winning the roller-dance contest and declaring the trophy "theirs".
"Princess Problems" has a few:
What Patch is doing at the beginning of the episode: leading the others in creating a playground for the orphans at the orphanage she grew up at for no other reason than to be kind.
The reason why Patch ultimately is scared to death of the possibility she's the lost Princess of the Isle of Pony: she's Happily Adopted and loves her adopted parents so much she can't stand the idea of being separated from them.
Rosy being reunited with her long lost parents, who'd been searching for her for years.
Meadowlark boosting Clover's confidence in "Send in the Clown" by telling her that she started out her dancing career just like her.
The ending to "Happy Birthday, Sweetheart!" where the girls, Teddy and Lancer all have a wonderful time at Sweetheart's birthday party. Then later, Sweetheart says her birthday wish came true: being able to enjoy it with her friends.
The others showing how much they care about Bon Bon throughout the episode, ending with Sweet Heart calling Teddy out for blackmailing Bon Bon.