For a show that honestly doesn't give a lot of focus to character or loftier meaning, Vegeta's concession speech allowed him to let go of the destructive anger he's latched onto for 3 sagas. It was a thoughtful and mature re-examination of his goals and showed him as an evolving character who fulfilled an emotional arc. It's not groundbreaking, but for this show it was surprising.
https://www.youtube.com/watch?v=O4Fqeq1VWdE
Also, agreed with Adventure Time - it actually has a lot of mature, progressive themes and ideas. The two that stick out both after Finn and PB break up: one was the with the "living dolls" that he emotionally manipulates to satisfy his curiosity about what relationships would work, the other when he admits to PB that he loved her and was afraid he would be drawn back into a relationship and get hurt again.
https://www.youtube.com/watch?v=O4Fqeq1VWdE
Also, agreed with Adventure Time - it actually has a lot of mature, progressive themes and ideas. The two that stick out both after Finn and PB break up: one was the with the "living dolls" that he emotionally manipulates to satisfy his curiosity about what relationships would work, the other when he admits to PB that he loved her and was afraid he would be drawn back into a relationship and get hurt again.