Very cool flash!
First, I loved this flash! I thought it was really unique and had a certain depth to it that made me want to keep watching.
As for an explanation I'm no doctor or psychologist, but I have read a few dream interpretation books so I will add my 2 cents.
Nets:
Nets in dreams can symbolize catching and/or stopping. So perhaps something is out to catch or stop you from doing something.
The building:
I believe that this building represents something like a half-comfort. Like this building with it's front wall missing sort of represents a form of shelter, but no protection bceause somebody could clearly see you inside of it. It could also be seen as a temporary solution to a problem. It's raining outside so it would provide relief from the rain, but it wouldn't suffice as a place to live.
Trees:
I trees that line the road could be seen as something designed to stop you from losing focus by keeping you moving down a predetermined path of some sort. These would be seen as more of a guide than a hinderance as if they had been suddenly placed in front of you, or all around you.
All in all this is a very interesting dream. If you want some real help analyzing it you should consult some books on dream analysis; you can find tons of them at bookstores such as Borders or on Amazon. Good luck!