a few changes from the book. So far, the series focused on the first book of the Trilogy, Wool. With the ending of S2, they hinted at delving into the second book. I assume they will go back and forth between that and what's happening in the Silo. You don't get Rebecca Ferguson for a series and then sideline her in S3.
BTW, Tim Robbins is fantastic in this, too.
QUITE A FEW...things that, had they been in the series, would have been anti-climactic on screen. It's not just the relationship between two characters (that I JUST KNEW would become something else), but who speaks to whom, from where. And character development for some needed more fleshing out in the series, whereas the book did not delve into these characters very much.
Either way, enjoying both immensely. So, watch Silo! It's on Apple.