Recommendation:
The Chernobyl Podcast
sorta the tv show equivalent of a DVD director's commentary track. Interview with the creator and writer, split into 5 episodes that correspond with the 5 episodes of the show. Lots of interesting info, ranging from how realistic they got when they could ("all the costumes are made with Soviet-era cloth that we tracked down in old warehouses") to the things they did deliberately inaccurately for dramatic purposes ("that guy was never there and never said those words, but the audience would have been lost if we didn't have that scene")