The Mentalist writers (@mentalistwriter) tweeted this picture of their Season 4 plan board. It reveals pretty big spoilers for both 4.22 and 4.23, and they took the picture down as soon as they realised. However, it was captured by several people before it was taken off . To prove this is real: check out their twitter feed - a picture of the same board, only closer (thus not revealing the last few eps) is still up.