Of course, we’re not the ones doing the allowing. It’s up to the screenplay writers to adapt the book to screen, however they see fit.
Sometimes the books themselves pose the problem: whatever universe is created in the author’s mind might be extremely hard – indeed, sometimes downright impossible – to translate to the screen in a believable way. In some cases it’s done masterfully, in others… well, the results can range from kitch to awful, with bad CGI and even worse acting and directing being the usual culprits.
But for the sake of this post, I have to assume that the writers’ and directors’ vision was originally to stay true to the raw material. To take this carefully crafted world they were handed in book form and bring it to life in front of our very eyes. So what is it that usually goes wrong?