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.
Patrick Jane's personal car is an early 1970's model Citroën DS, manufactured in France from 1955-1975, and sold in the U.S. from 1956-1972. 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.
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) searched for.
The trivia items below may give away important plot points.
Every episode title, until episode 6.8, contains a reference to the color red, like "Paint it Red", "Scarlet Fever", "Russet Potatoes", or "Bloodshot". This is because Patrick Jane's nemesis is the ingenious, sadistic serial killer, Red John. Beginning with episode 6:9 (My Blue Heaven), Red John has been caught, so this theme is discontinued.
Red John never made an attack, nor directly influenced the events of any season premiere. He never attacked, nor acted in some way, shape, or form in every single season finale. In general, the season premieres dealt with the repercussions of Red John's actions from the previous season's finale.
The series premiere and series finale are mirrored reversals of each other. Whereas "The Mentalist: Pilot (2008)" begins with Jane having lost his wife and daughter, "The Mentalist: White Orchids (2015)" ends with him and Lisbon beginning their new life as a married couple and her revealing that she's pregnant.