The Arrival - S1-E4
Trivia: Michael Cerveris makes his first significant appearance in this episode as The Observer/Bald Man. However if you watch the series from the beginning, he makes fleeting appearances in every episode, sometimes on a tv screen.
The 10 Li'l Grifters Job - S4-E2
Trivia: Timothy Hutton is pretending to be Ellery Queen, the world's greatest detective. His real life father Jim Hutton played in the TV series "Ellery Queen" in which he was a detective.
Trivia: The lakeside cabin Jane bought was shot on location at Disney's Golden Oak Ranch. It is called 'Cabin by the Lake'. Http://www.lamag.com/citythinkblog/scene-golden-oak-ranch-mentalist/.
A Knight In Shining Armor - S1-E1
Trivia: When the bad guys first enter Graiman's garage, the original Firebird KITT can be seen from the original series.