this seems inspired by the giallo movies of the 70's , but de palma is more sophisticated and blends hitchock rip-offs with dario argento visuals, and makes it a style of his own. the performances here are right on the spot: craig wasson is simply great as the flawed hero, melanie griffith is at her best as the pornstar.
this is a strange movie, and not for all tastes, but it's rewarding. the suspenseful chase in the shopping mall is a high point. and one thing that most reviewers forgot: it's a somewhat cynical view on hollywood: some actors do b-movies and others do porn. and de palma does a mainstream movie saying: these characters aren't worse or better than mainstream actors. that's the real idea behind... body double. get it?
it's funny how most people focus on the violence towards women or performances or plot holes. great movies are about vision, they are poetry on the screen. and, like it or not, de palma is a poet.