Update: Cathy points out in her comments that this is a Google generated review and Google allows this on any of their reviews.
It is not clear if this is an experiment or a very limited move towards user managed content, but Google is now offering an option to flag some reviews as inappropriate. Of the 21 reviews that this restaurant was showing, only the last one offered an option of flagging. It could be that Google was offering this option because the review was from a less trusted source or offered a star rating significantly less than the average.
Google Maps offering limited options to "flag" inappropriate reviews. by Mike Blumenthal