There's a very interesting essay comparing Heinlein's Starship Troopers and Verhoeven's Starship Troopers, including some material about potential misconceptions about the novel.

Thoughts on Starship Troopers

I'm using it as a basis for my similar comparison of Dick's The Minority Report and Spielberg's Minority Report, complete with excoriation of the latter. One of these days I'll finish.