it's a decoy trap street! The trap works this way: an attention-grabbing joke distracts the copycats so they won't notice that, a quarter mile away, Google's put in an extension to "Parker Hill Rd." that isn't really there. Voila: Parker Hill Rd. extension shows up in copycat map, Google catches them.

Alternate theory: the Google seinfelds were so busy joking around with "nothing" that they screwed up Parker Hill Rd.