I don't know... 99% of the really thin streets in the examples do seem to be "dead end" streets. I think you just found an error (which wouldn't surprise me, given how many minor errors I've found on Google Maps in the past year).
There was a time in U.S. history when it wasn't uncommon for several generations to be living together under the same roof. All of this "oh, he's twenty-three, why's he still living with his parents?" non-sense would sound very, very strange to someone from yesteryear.
"According to a survey from National Association of Colleges and Employers, the class of 2009 is leaving campus with fewer jobs in hand than their 2008 counterparts. The group's 2009 Student Survey found that just 19.7 percent of 2009 graduates who applied for a job actually have one."
Example: http://forecast.weather.gov/MapClick.php?lat=41.893077299131...