Jane replies to the notion that Red John might be a genuine psychic by saying: "Please. And what if dolphins were actually aliens from another galaxy? That would be kind of cool." This is a nod to the Hitchhikers' Guide to the Galaxy which details how the dolphins left the Earth before its destruction and their final message to mankind. The 4th book in the trilogy of five is named after that message - 'So Long and Thanks for All the Fish'. This sentence/title was previously used to name another episode of The Mentalist - "So Long and Thanks for All the Red Snapper".
Scott Anthony Leet [Roddy Turner] appeared on The Guardian, another Simon Baker show.
Red-haired actresses: Laura San Giacomo, Tangie Ambrose.
Lisbon mentions that the song "about a cake being left out in the rain" reminds her of her mother feeding pigeons. In the movie Vertical Limit, Chris O'Donnell (playing Robin Tunney's character's brother) sings that song (MacArthur Park) and she didn't believe it was a real song.