The gas station which Rambo blew up as a diversion was built specifically to be destroyed, as was The Outpost Gun Shop.
John Rambo's character in the book kills all of the cops BUT he doesn't kill anybody in the movie, the only cop that dies fell from the helicopter and was not killed directly by Rambo.
The novel 'First Blood' takes place in Kentucky during the summer. At the end, Rambo dies. Trautman kills him with a shotgun blast to the head.
Contributed by: Mitch Ryder
In the book, Rambo kills all of the cops, instead of only killing one in the movie.