I just watched episodes 3 and 4 (been traveling) and don't claim to be as good as you guys at catching all the clues. However, I think Mark is The Mole. He is a history teacher,and in the Crusoe challenge, put something that obviously didn't belong on the table(jeans I think) He put back gold on the table in order to take the scale. He kept insisting that Craig take time to rest. Opted out of the underwear challenge. I think that the whole journal thing is a ploy. I read in an earlier post the 810 thing, which makes me think it's Mark. In episode 4, Jon is talking about the quiz and who the mole is and they show Mark's bag(but also Nicole's) Now having said that, there are many clues to point to Craig, Clay or Nicole. The 'moel' with the arrow pointing at Nicole seems like a great clue, as do all of the 11 theories. So, after all that, I guess I don't know who The Mole is! But Mark is my main suspect and he doesn't seem to be drawing much attention here.