The Darlene twist is the bigger and better twist
by far, it completely upends what you thought their relationship was and explains why she knows where he lives, is friends with his friend, has open access to his apartment, talks shit to him in the first or second episode when he questions her over some dumb thing, etc. Mr. Robot basically doesn't change anything for anyone else.
That moment and the encounter with Tyrell's wife in the street are like the two "somebody hold me back i'm about to lose my shit" moments from the first season for me
spoiler (click to show/hide)
although just randomly murdering what seems like a regular character has become so normal that them actually doing it so early was a bit surprising as I figured it'd be something to keep for later, also the way they did it leaving her in the trunk, etc.