When Abigail disobeys Cornelius, who told her to stay away from the poison gas, and rescues Michelle from her gas-filled house. Cornelius, later, expresses his thankfulness to Abigail.
Cornelius: Abigail, for once, I'm glad you didn't listen to me.
Abigail defending herself from a hungry owl with a thorn and a magnifying glass.
Also when Edgar stands up to Waggs when he insults Michelle.
Waggs: Why would a mole, a mouse, and a hedgehog try to save a foul-smelling, worm-eating, good-for-nothing badger?!
Edgar: Michelle's none of those things! She's our friend, understand?! Stand aside!
The fact that the film ends by subverting (in the correct use of the term) Humans Are Bastards so thoroughly! Cornelius sums up the effect this must have had on every 90s kid watching this for the first time: "In all my years, I... I've never seen..."