"Hey, nobody told me that character was a woman!"
So you never exchange a word with at least someone involved in pre-production and production?

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Depends on the project. You're mostly two steps removed from the actual production. If you have questions, you ask your editor, who asks the licensing person at the studio, who tries to get hold of somebody actually working on the movie, who are often too busy filming the movie itself to worry about the novelization very much.
Because this can be a time-consuming process, I choose my battles carefully and don't bother the movie people over every little detail. In other words, I'll plead for a photo of the doomsday machine (since that's a big deal), but not worry too much about a minor character who only appears in one scene.
Ideally, you also get a stack of publicity photos, some concept sketches, maybe even an advance copy of the trailer, but this tends to be spotty and incomplete. You'll get ten pictures from one scene, and not a single shot from the next one . . . .
There are exceptions, of course. On the UNDERWORLD books, Danny McBride and Kevin Grevioux both let me contact them directly if I had any questions, but, again, I tried not to abuse the privilege.
Basically, you're trying to write a 300-page description of a movie you haven't seen yet, based on an early draft of the script and a handful of publicity photos.
It's just as easy as it sounds!
