Director's commentary for Primer
Keeping up with all of the extras they include these days on DVDs is exhausting, to say nothing of watching all the movies themselves. But I made a point of listening to the director's commentary for Primer and was not disappointed. If there's a Shane Carruth fan club, sign me up. Case in point: for the single special effect in the film, he filmed a scene with a DV camera, uploaded the footage onto his computer, added the effect digitally, dumped the modified video onto tape, filmed the video playing on a camcorder screen with the film camera, and made the whole thing look like it was supposed to be done that way because he didn't have the money to do it any other way. It's all about constraints...which ties into the main message of the movie as well.
Also, Carruth confirmed my feeling that Primer really isn't a sci-fi film...what's happening with the characters emotionally is the focus of the film.