Basically, both movies and the book forces us to ask the big question "why?" Why do we view the world around us the way that we do, and is human development unique, or are we programmed to be able to understand similarly? The book says that we retrieve and respond to information similarly, regardless of race, gender, and age, although, for those with certain learning disabilities or traumas, we do not.
The movie The United States of Leland, shows disassociation in a young man, and offers the question, not just "why did he do it?" from a narrative perspective, but 'why did he do it?' in a physiological pov.
In Dragonfly, what are the final moments we see before Death takes us? Is it our brain collecting information that we do not understand at a conscious level? Is our life the ends really the end or the beginning of something else much more fabulous and wonderful, and is it just for us alone, or is it different for everyone?
Neither the book nor the movies have complete answers... no one does, No One at all.