Contains Spoilers!
I believe there's a mole at CBS! Think about it:
1) 11/03: Due to a late football game, the decision is made to postpone "Fire & Brimstone." Yet, at the end of the substitute/repeat, they air the promo for "The Great Red Dragon" which spoils the tattoo reveal for fans. Simon Baker appeared on several talk shows that week, but was limited in what he could say because "F & B" had yet to air.
2) 11/17: The promo for "Red John" at the end of "The Great Red Dragon" contained spoilers. Surely someone knew a simple pause or slow motion would be revealing too much.
3) 11/21: CBS posted a Behind the Scenes Featurette to their press express page. The "Red John" episode was right there. Surely they knew some might know how to access it and wouldn't keep such news to themselves.
4) 11/22: Apparently CBS themselves made public a link to a picture of Red John, spoiling the reveal for fans:
From @aleee_o
Noooooooooo. CBS has leaked a picture of Red John on ow.ly
5:26pm - 22 Nov 13
Why would CBS do this? It doesn't make any sense. One slip up, maybe, but all these together? It looks like someone inside has set out to sabotage The Mentalist. Very unfortunate!