Rats.

If NYC is only in the movies, what's physically there in his world? Gotham City? An active volcano? A huge bathplug?

What else is "only in the movies"?  iPhones?  Velcro?  Ejaculation?  Pizza?  Nipples on your chest where your USB ports are supposed to be?

Is the movie called "Purple Rose of Cairo 2: Recursive Boogaloo"?

I presumed 'magic', because the movie features floating mountains in an area where gravity still works the way it does elsewhere in the vicinity; waterfalls fall down, there aren't huge winds caused by differing air masses, etc.. Already, whatever the laws of physics are for us, they're different in the movie. Maybe those mountains don't have a mass of a million tons, but only a million grams.

Plus, not wishing to sound like a Baroquen web developer, but what happens to the mass-times-distance economic argument when some bugger invents warp drive, and we get to short-cut 99.9999% of the way?