In the episode where Hightower is framed as the killer of Todd Johnson (Season 3, episode 16), Bertram, in a strange scene with Lisbon and J.J. LaRoche, quotes the poem "Cradle Song" by William Blake:
"And when thy little heart doth wake / Then the dreadful night shall
break." (LaRoche was the one who identified it as Blake.) Red John
quoted a different poem, "Tyger Tyger"
by William Blake, to Jane when he rescued him from being killed by
deranged college kids who were killing people Red John- style. On his
deathbead in a hospital burn unit, Todd Johnson's last words were the title of that poem.


Also, Bertram R. Forer was a scientist that experimented The Barnum
Effect for the first time (also known as Forer Effect), which is related
to cold reading (the ability to gain information about someone without
that person realizing that they are actually giving the information
themselves) which is what Jane often does and a skill that Red John must
be very good at. It might be a coincidence, but it can also be
something that Bruno Heller wants the viewers to think about. In a
previous interview Heller stated that Red John likes the cold, a
statement that has been often interpreted for cold weather, but there is
a possibility that cold in the sentence is related to cold reading
instead.