This is the second episode in a row where Jane makes a reference to The Wizard of Oz.
Jane's lock-and-key maneuver to enter and relock the locked room was used by Peter O'Toole in the movie "How to Steal a Million" (1966).
The legend "he is mar" is puzzling as it actually provides no clue as to the name or status of Red John as finally revealed in series 7. Supports the suggestion that the writers had not made their minds up ab initio as to Red John's identity.
Red-haired actresses: Danielle Langlois, Kathleen Coti.