Executive Meddling: Masayuki Ochiai, the director of the movie, stated that the producers basically forced him into making it more like a love story. He goes on to say that there were so many compromises made that it couldn't be a true horror movie.
Parasite Eve (the game)
What Could Have Been: The Parasite Eve artbook contained a storyboard for the FMV where Aya parachutes down for a final confrontation with Eve on Liberty Island. In the game proper, Eve simply gives a calm smirk towards Aya. But in the storyboard, Eve is described as her expression changes completely; she frowns like she is growling in a monster-like expression, as seen here.