Zuri's report about Bertram and his job in "Creepy Connie's Curtain Call".
The funeral for Milly the Mermaid. Yes, a funeral for an imaginary friend.
"All the Knight Moves" has quite a few. Zuri (who had take Took a Level in Jerkass in season 2) wanting to win a trip to Paris for Jessie despite putting so much pressure on her. She then gives it up after she learns her opponent left his family in Paris to focus on chess, regretted it, and wanted to win to see them. Even though Jessie was really upset she wasn't going to Paris, she was still proud of Zuri for helping him. To top it all off, Zuri calls her dad and gets him to let them use the jet to go to Paris that weekend.
In "Quitting Cold Koala", why Luke is so attached to Kenny: Kenny was the only one who was always there for Luke at the orphanage until he was adopted. He doesn't want to lose what he considered his only family at one time.