
In the series, she's more inquisitive and becomes far more actively defiant.
In the book, she was a much more shallow and superficial character who barely thinks much deeper about how her society functions. This also goes hand-in-hand with Adaptational Badass, as he's more successful in shaking up the society of New London and is quicker to use violence. His book counterpart only had sex once in a moment of weakness after using Soma, and felt terrible about it afterward, as he only wanted to have serious, monogamous relationships. He shows far less of a cultured air and unlike his book counterpart he has casual sex with a string of women (plus some men) very willingly.
John the Savage is quite changed from how he is in the book. Mond is also given a race lift, becoming black. Additionally, it adds more women, and some male characters (such as Mond) are gender flipped as well. Here, they are nearly as common as white people. Adaptational Diversity: The book didn't describe many New Londoners as being people of color. He's quick to use violence (or incite others) in contrast with his book counterpart too.
John, unlike his book counterpart, also successfully makes many New Londoners question their society and helps inspire a revolution. Linda is also a lot stronger here and shows useful skills, whereas in the book she's a weak, useless person.
Adaptational Badass: Lenina was a much more shallow character in the books, only deviating mildly from social norms here, she's fleshed out much more and grows actively defiant. Adaptational Attractiveness: Bernard, Lenina and Linda are quite a bit more good-looking than their book counterparts are described as. The series instead heads in the direction of his presence causing upheavals in society and citizens beginning to question the cost of a "utopia", along with a violent resistance/terrorist movement who rise up in the "Savage Lands". Adaptational Angst Upgrade: The book was basically the story of John struggling to find a place in New London but eventually leading to self-exile and suicide, with his actions never causing any change. Accidental Murder: The Director is accidentally killed by John when struggling with him on the edge of a cliff, over which he falls to his death.