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That street ends in a cul-de-sac. That's not really a dead-end.

There are plenty of other streets on that map that end the same way, but are thinner.

After examining the streets in the town I grew up in (Overland Park, KS), I think it is more likely that you found an error.

Whatever kind of algorithm they are using here, I'm quite impressed by it.

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).