I'm going to admit something. Every time my Dad and I watch watch Aliens and it comes to Bishop heading out to the uplink tower, my Dad tells me that there was a bit in the novelization where Bishop encountered one of the aliens and it didn't know he was there because he had no body heat and heartbeat, which the xenomorphs have the ability to detect.
Now, I know that many do not consider novelizations as a valid canon source, despite the fact that they are based off the screenplay of the film (or in some cases a previous draft of the screenplay for the film). But, I began to wonder what details from novelizations that you feel did the best job at explaining something seen on the screen. This can be small details or even background information.
For me, one of the ones I like is from the Pitch Black novelization by Frank Lauria, which talked not only about Riddick's background, but why Johns is a stim junkie. According to the novelization, Riddick was former military and was a guard on some sort of prison colony ran by a company. He witnessed a lot of terrible things occurring there, and grew a bit of a conscience. So, he started gathering evidence with the intention to expose the actions by the company. However, the company found out, manage to get rid of his evidence and framed him for a crime he didn't commit. As a result, he ended up being sent to prison, where he ended up escaping quite a few times. The company would hire bounty hunters to catch him, and for each one he killed in self-defense, the company would add it to his list of victims of his "serial killings." Eventually, he ran into Johns for the first time and shoved a shiv right into his spinal column. The medical unit removed the shiv, except for the very tip, which was pressed up against the spinal cord (which is why he became a stim junkie, because the tip still causes him pain. This is revealed in the Director's Cut of the film during the scene where Carolyn Fry finds Johns while he's injecting). From what I recall from reading (which was a long time ago), the reason why Johns was able to capture Riddick during one of their later run-ins was because Johns held a kid hostage and threatened to kill the kid if Riddick didn't give up. As a result, Riddick did, which resulted in Johns and Riddick being on the Hunter-Grazner's ill-fated flight.
So, what about you guys? Any particular novelization detail that explains something in the film that you guys happen to like?