Early in the film, PKD tells his buddy that he just finished his new novel and it will be published in hardcover (a nice change, since his early SF were all published by cheap paperback houses), then in reply to the question of it's subject he says, it's a what if the Germans won WWll premise. He's obviously referencing PKD's arguably most successful novel (it won the Hugo) published in 1963. The film is set in 1985, but since Dick was dead for three years already in this universe, maybe it was an intentional distortion.