It is possible that whoever Google has hired for the local edits uses OSM as a reference in response to feedback received via Google Maps. Not explicitly of course, because this is strictly forbidden, both ways, due to license incompatibility. For OpenStreetMap this is a very important point, because well-meaning novice mappers copying streets or points-of-interest directly from a proprietary map put the project at risk of litigation. Google will likely have such a strong rule in their own internal documentation as well.

OSM strongly discourages the mapping of trap streets — fake streets that only exist on your map for unscrupulous competition to copy so you know that they did so — but it's possible that some mappers do put these on the map. I don't think one of the big proprietary maps has ever been caught copying one of these though.

I can confirm that Google appears to import data from OSM.

I added a placemark in OSM in the middle of Bali, Indonesia for an Internet cafe a few years ago, and it's currently also in Google Maps. (The cafe has since been closed for a few years.)

What's interesting is that's why I added it to OSM - to get picked up by Google Maps. :)

What's even more interesting is that when I told people in SV that I was doing that, they told me since it was a copyright violation, Google Maps wouldn't do that. :) :)