What does the color red have anything to do with the show The Mentalist?

Answer 1

The colour red refers to the leading antagonist in programme nicknamed "Red John". With the exception on the first episode "Pilot", the titles of all episodes refer or allude to "Red" as a word, color or concept because of this.

Answer 2

The color red is significant in The Mentalist because it is the color that the main character, Patrick Jane, associates with the serial killer known as Red John. Red John is a key antagonist throughout the series, and his presence is symbolized by the color red.