It's a tougher theme IMO because it involves modelling something specific, not just turning in a nice picture. If a challenge theme were "a cityscape" you can let your imagination run riot. If the theme was "cityscape of San Francisco", then you have to make your picture look recognisably like San Francisco - it doesn't matter that there are any number of possible views. Similarly here, any entry will be judged on "does it look like the actual movie scene?" rather than just "is this good art?".