I definitely recommend the two books by William Goldman mentioned above. Adventures in the Screen Trade is great because it talks about successful films he wrote, and Which Lie Did I Tell? is great because it talks about a lot of films that didn’t work out so well
Julie Salamon - The Devil’s Candy - really fun and detailed book about why Brian De Palma’s adaptation of ‘Bonfire of the Vanaties’ was a mess, despite the talent involved
Steven Bach - Final Cut… (insert long subtitle I can’t be arsed to write) A similar thing to the above, only about Michael Cimono’s ‘Heaven’s Gate’
Keith Phipps - Age of Cage - good film critic going through Nic Cage’s entire career film by film and making the case for why he’s mostly underrated
Peter Biskind - Easy Riders, Raging Bulls is really good about the 1970s. Another of his books - Down and Dirty Pictures is also really good - about the rise of independent cinema in the late 80s and 90s. I think the book does a pretty good job of portraying Harvey Weinstein as an asshole, but only in the context of him as a producer. You can fill in the gaps about much he was an asshole the rest of the time.
Any or all of Roger Ebert’s books are good. ‘I really really really (insert how many) hated this movie’ and ‘your movie sucks’ are both fun reads of his negative reviews
James B Stewart - Disney War - good book about Michael Eisner’s reign at Disney