I've read Chiang's book about two years before the movie aired and it really is top-notch speculative fiction that I highly recommend to any Sci-Fi lover.
Even though Denis Villeneuve, Eric Heisserer and Ted Chiang himself did a wonderful job with the screenplay, while managing to convey the main ideas and emotion of the book, there are quite a few details about the process of translating Heptapod A and B that didn't make it into the movie, details which would have painted a more complete picture of the situation for the interviewed professor of linguistics that was interviewed in this article.
[1] https://www.goodreads.com/book/show/18626849-stories-of-your...