Guy probably confused himself having 7 cars pulled over. I don't mind cops, but what's the point in waving over cars like that? They do it on the interstate near me....one time I swear he was waving at me, but I kept going. He already had two people pulled over so he could come get me or keep his other 2 fish.
Lesson....check the ticket before you drive off. If you had noticed it before leaving, you could have asked him. He probably would have recognized his mistake. Only human. Except Reno 911....they're supercops.