A Google Maps Help thread has an interesting report of one business having the reviews of another. If you look at the Thomas French, DC, Chiropractor reviews, they look great, but when you look at Dr Keith Overland, it seems like he has reviews for Dr. French.
Here are the reviews on Dr. Keith Overland's page, which all reference Dr. French:
Two things could of happened here:
(1) It could be a technical glitch with Google Maps where reviews moved from one business listing to another.
(2) The people who left reviews accidentally put it on the wrong business listing?
Both businesses are in Norwalk, Connecticut - so who knows.
Forum discussion at Google Maps Help.