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Dick's screenplay differs from the source material, featuring numerous scenes that are not in the novel.

According to the foreword of Ubik: The Screenplay ( by Tim Powers, a friend of Dick's and fellow science fiction writer ), Dick had an idea for the film which involved " the film itself appearing to undergo a series of reversions: to black-and-white, then to the awkward jerkiness of very early movies, then to a crookedly jammed frame which proceeds to blacken, bubble and melt away, leaving only the white glare of the projection bulb, which in turn deteriorates to leave the theater in darkness, and might almost leave the moviegoer wondering what sort of dilapidated, antique jalopy he'll find his car-keys fitting when he goes outside.