In most of season five, Amanda Righetti (Grace Van Pelt) was pregnant. Since it didn't fit in with the story line, she can only be seen sitting behind a computer or in dark shadows in almost every scene, and doesn't go into the field.
Owain Yeoman is in fact Welsh; he puts on the American accent he uses, which even fooled the other cast members, as he always stayed in character, even when the cameras weren't rolling.
In every close-up shot you can see that Patrick Jane has dilated pupils. That is, as he himself says about other people he encounters, a sign of shock or hypnosis.
An outdated nickname for Patrick is Pink, and 'Jane' is a female version of John, making Patrick (Pink) Jane a variation of Red John.
The concept for the show (a man who is hyper-observant and fakes being a psychic) is the same as the series Psych (2006), which aired two years earlier.
In most episodes the victim or perpetrator has a name indicative of his true character. Examples: McTyranny, Quick, Just, Unjust.
Patrick Jane's personal car is an early 1970s model Citroën DS, manufactured in France from 1955-75, and sold in the U.S. from 1956-72. The DS was the first mass production car to offer hydropneumatic self-leveling suspension with an option for the driver to manually raise or lower the chassis at the push of a button.
At the end of the pilot episode Jane brings the team donuts to celebrate closing the case. The case-closing celebration becomes a CBI tradition, with the food of choice changing to pizza.
The names of several characters are taken from the 1960s TV series "The Fugitive (1963)". "Red John" is taken from the name of the one-armed man: fRED JOHNson. Kimball Cho gets his name from Dr. Richard Kimble. Madeleine Hightower gets her name from the high tower in the ending of "The Fugitive".
The show has included several real life family members of the cast: Owain Yeoman's (Wayne Rigsby) then wife, Lucy Davis, appeared in the The Mentalist: 18-5-4 (2010), as Daphne Valiquette, while Simon Baker (Patrick Jane)'s wife, Rebecca Rigg, daughter, Stella Baker and son, Claude have all made appearances. Rebecca appeared in The Mentalist: A Dozen Red Roses (2009) as Felicia Scott; Claude appeared in The Mentalist: Red Sails in the Sunset (2012) and Stella appeared in The Mentalist: The Greybar Hotel (2014), as the Angry Inmate.
Lapsang souchong, the tea that Patrick Jane drinks, is a type of black tea originating from China. Black tea is called "hong cha" in Chinese, which translates literally to "red tea".
Frequently there is talk of putting out a "BOLO" on a suspect or missing person. This is an acronym for "Be On The Lookout", a term synonymous to an APB--All Points Bulletin--stating all the specifics of the person(s) being searched for.
It's mentioned that Lisbon is from Chicago, which actually is Robin Tunney's hometown.
Of the five original lead actors of the show, Tim Kang (Kimball Cho) is the only one who is from California, the show's primary setting. Simon Baker (Patrick Jane) is from Tasmania, Australia; Robin Tunney (Teresa Lisbon) is from Illinois; Owain Yeoman (Wayne Rigsby) is from Wales, UK and Amanda Righetti (Grace Van Pelt) is from Utah.
Charlotte Jane, the daughter of Patrick Jane, received her name from producer Bruno Heller's father, who wrote Hush, Hush, Sweet CHARLOTTE, and What ever Happened to Baby JANE.
The first seven minutes of the opening of The Mentalist has Jane living vicariously through a character named June who kills the man who killed her daughter, just as he would like to do.