Some of the RP editions have an afterword about publishing in Soviet and evading censorship thorough Sci-fi, pretty interesting. Soviet was a strange place.
Roadside Picnic is a lovely perspective on the genre, in that it isn't at all about the zone or any supposed aliens. The zone makes for a fascinating backdrop for the story, but in the end it is about the people just trying to carve out a life while exposed to an extraordinary, incomprehensible situation grown mundane. The zone could be swapped out for a disaster area or a hostile jungle or whatever, but by being the zone it becomes very alien to the reader as well. It contributes to what I really like about the book, simply being very atmospheric and immersive. It's all show-don't-tell, the reader experiences everything through what the characters see or hear, and the reader's picture of the world is as clouded and uncertain as those living in it. I found a bit of the same feeling in Metro 2033, where anything happening outside of a couple kilometers range is just rumours. Nobody really knows anything for sure and neither does the reader!
Also there was actually a RP TV-series in production with a really cool trailer, but I think the pilot didn't take off so it shut down.