I sort the order to “age” and go by that or Steemworld.org because it is more precise with comment entry.

I use the honour system and hope most people don't cheat by changing their answers, because checking every answer for edits would take forever.. but if I/you notice something than there is a nifty tool http://scribe.steemian.info/ created by @drakos to check if one has edited the comment.
In this post, I believe that @gregory-f has the answer “Billy Madison” (not edited) before @gillianpearce.

I will add “No Edits” as a rule in the next game, if it is a concern.

Thanks for taking an interest. Glad to have you on board.