I watched through the episode 2 1/2 times and couldn't come up with a real hidden clue. But the car's license plate was interesting:
Anderson even points out it spells the mole - LMEO = mole.
What about the rest. I'm thinking 56 in 01 - that could mean someone was 56 in 01 - like Bill, who is now 58? or could the 5601 mean something else? 5/6/01?
It seemed like there was no real reason for the "neutralization" game. Why was it kept so secret - in the end no one knew for sure it was Bill. Could it have just been put in there to keep our suspicions away from Bill as the Mole? The real mole really wouldn't care who,if anyone is neutralized, since he always gets an exemption.
I'm now definitely thinking that Dorothy is trying to make other people think she is the mole by her actions. If she were the real mole, why figure out the combination lock clue? It would have been easy to just try other combinations that didn't work and hope that no one figured out the answer. A simple way to save a big $30,000 for the pot. Also she pointedly wouldn't drink the "wine." She didn't know it was worth money, but by refusing to drink it made her look guilty, and thus point suspicion towards her. She and other players should have realized that stomped grapes = grapejuice, not wine, which takes time to ferment, by the way.
Healther looks too much like the same "type" as the Mole 1 Kathyrn. I don't think they would choose the same type twice, so definitely eliminate her.
The complicated and long ball game seems like a good way for them to give an exemption to the actual mole while making it look like a random exemption. Anderson is the one who picked which tired person to choose - it wasn't the last one left, which would be more random, or the one who goofed up first. Seemed more like he just waited and then picked the third.
I do love this show though.