: Unlike the book, the 2020 series portrays Helmholtz (Helm) as an artist of "Feelies" who is increasingly bored by the low emotional baseline of her society. In "Firefall," she begins to crave feelings that are "bigger, scarier, and deeper" than allowed. Lenina’s Internal Rebellion

A central theme of the episode is Lenina Crowne’s struggle with her own conditioning. After her traumatic experience in the Savage Lands, she begins to resist her soma intake to maintain a "part of her that is just mine".

: Lenina experiences uncharacteristic symptoms like intense aggression and sadness, which she attempts to hide from her peers.