* DesignatedHero: He's not a jerkass, but Matt's the hero. Everyone listens to and does everything he says - even aliens! They have the entire population of Manhattan to pick from, but because Matt's there, he's put in charge.
* HarsherInHindsight: It didn't seem so odd when the book came out in 1993, but the way the city handles the crisis like it's a normal day at the office seems downright silly after we've actually seen UsefulNotes/NewYorkCity in a real, dire crisis twice in TheNewTens (9/11/2001 and the [[http://en.wikipedia.org/wiki/Northeast_blackout_of_2003 Great Northeast Blackout of 2003]].)
* InferredHolocaust: The water rushing into the huge hole Manhattan was taken from is bad for everyone in the connecting tunnels and anyone in boats and ferries.
* TheyWastedAPerfectlyGoodPlot: [[spoiler: We ''never'' find out about how they get home or how New York (and the rest of the Earth) reacted to the sudden loss of Manhattan to aliens.]]