OK, it seems that Wikipedia does have a few nice features. :)

I was able to quickly search History on the entity and find that Dexbot had imported the erroneous statements https://www.wikidata.org/wiki/User:Dexbot  <-- pretty cool options there, Good Job whomever !

and let the User (owner of the bot) know of the problem.  https://www.wikidata.org/wiki/User_talk:Ladsgroup

On Sun, Sep 27, 2015 at 11:38 AM, Thad Guidry <thadguidry@gmail.com> wrote:
I had to clean up this entity that had Sister City property filled in with lots of erroneous statements for it that I removed.

How can I figure out where the import went wrong, how it happened, and how to ensure it doesn't happen again ?  How does one look at Wikidata bots and their efficiency or incorrectness ?

Trying to learn more,