Grandma's House

I've been thinking about The Mole, and I'm not sure now that Mark is the mole. The reason I say that is because of the barrels at the vineyard. One barrel the camera focused on was marked N20 HL70. When I Googled that set of numbers, it came up as a couple of color pigments, orange and yellow. Now I'm thinking that may have been a clue, and maybe Clay is the mole. Does that make sense? They're both still in the game. We'll see.