Could be copyright traps to detect unauthorized copying of the map:

https://en.wikipedia.org/wiki/Phantom_settlement

So the towns that show up did exist at one point in the 1800's and early 1900's for a couple. They were towns in the past, but aren't anymore. So I'm not sure they're paper towns. As I understand it, those never existed at all.

Map Men have a fun take on it: https://m.youtube.com/watch?v=DeiATy-FfjI

(Their whole series is brilliant too!)

Four of them in basically the same spot?

Good one. These are the real easter eggs