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Spoilers (1)
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.
After the conclusion of the Red John story line midway through season six, the titles ceased including some reference to red in all of the titles, and started including some reference to other colors (not red) in all of the titles instead.
Patrick Jane's personal car is an early 1970s model Citroën DS, manufactured in France from 1955-1975, and sold in the USA 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.
In most episodes the victim or perpetrator has a name indicative of his true character. Examples: McTyranny, Quick, Just, Unjust.
The California Bureau of Investigation is the investigative branch within the California Department of Justice.
To date, Red John has never made an attack or directly influenced the events of any season premiere. He has attacked or acted in some way, shape, or form in every single season finale to date. In general, the season premieres deal with the repercussions of Red John's actions from the previous season's finale.
Spoilers
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. After episode 6:8, beginning with episode 6:9 (My Blue Heaven), Red John has been caught so this theme is discontinued.