At the start of the episode Jane and Haffner take an elevator ride. When Jane presses the button on the outside, it glows yellow. When Haffner presses a button on the inside, it glows red. This detail references the fact that Haffner hasn't been cleared as a Red John suspect yet.
Red-haired actress: Beth Riesgraf.
Beth Riesgraf (Kira Tinsley) starred in Leverage; Drew Powell (FBI Agent Reede Smith, one of Jane's Red John suspects, who appeared in the episode before and after this one) played a recurring character in that show.