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Eliza gives up her powers to save her sister.
While in the boarding school in London, Eliza manages to fit in with a group of girls, who take interest in hearing about her interactions with wild animals.
Said girls are also happy to help in any way they can to save Tally from the poachers.
Before that, we get one that starts out as a Tear Jerker—as Eliza is sent to boarding school, she can't find Darwin and worries that he ran away before she could say goodbye. When she gets there, however, she discovers that he stowed away in her bag. Her initial reaction (as in, before she remembers that him being there could get her in trouble) is nothing short of thrilled.
Eliza: (after Darwin jumps out of her bag) DARWIN! Darwin: (with a tone of playful snark) Well, you didn't think I'd let you get civilized without me, did you? (Eliza hugs him)
This line from Darwin when Eliza suggests going to the river to find some poachers who might have Tally.
Darwin: Eliza, no. If those awful people see you again, they'll... well, they'll hurt you. And I'm not going to let that happen.
Debbie giving Eliza a pep talk after her powers disappear.
Debbie gets a surprising amount of these in the movie; particularly, her friendship with Boko and a scene where she reads "Jack and the Beanstalk" to Donnie.
Debbie's bond with the young warrior Boko who saves her from wild boars (and a snake). Despite not speaking their language or understanding his people's customs, she ends up forming a strong relationship with both he and his tribe. Bonus points for how he gifts her with a tribal skirt and she gifts him with her watch as a memento. He even learns how to drive the Comvo-Con to save her. Truth in Television, as it's known people can communicate with others even with a significant language barrier.
Debbie: Please, keep it. You know... friend?
Boko:(smiles) Friend.
Darwin sticking by Eliza's side even after Eliza loses her ability to communicate with him, especially since the last thing she said to him in his language was screaming at him to be quiet.
The ending. After Eliza gets her powers back, Debbie becomes her Secret-Keeper and Tally's returned to his parents, the Thornberrys all have a Dance Party Ending, instigated by (who else) Donnie. As joyful wackiness occurs all around him Nigel turns to the camera and narrates "The furless primates behind me are part of an untamed subspecies, known as the Thornberrys!" before beckoning Marianne to dance with him, which she accepts.
Grandpa Ratcliffe assuring Marianne that her children will be fine when lost in the jungle - not because they're Thornberrys but because they've been raised by two wonderful parents.
