TerriEdda tweeted: “Kevin Costner on the set of Castle. Just visiting, folks. And ME in the boots." With link to photo:http://tweetphoto.com/9177893
Venice4charge tweeted: “Kevin Costner and Stana Katic talk shop on the set of Castle." With link to photo: http://tweetphoto.com/9178635
Nathan Fillion who plays the part of ‘Castle’ tweeted today: “I just met a hero of mine today. I won't sully it by dropping a name, but DUDE! A hero!” The speculation on twitter is that he was talking about Kevin!