The title "Terra Incognita" is a Latin phrase meaning, "unknown land".
The baby picture of Carter and her son Taylor, is a real life picture of Taraji P. Henson and her son Marcel.
Taraji P. Henson's first appearance as Joss Carter since season 3 episode 9 "The Crossing"
Harold tells Reese that Bear(the dog) has chewed a first edition Gatsby. Reese says he will buy him another. Harold says he doesn't pay Reese enough to be able to buy another. First edition Gatsby's, in original dust jacket, sell for $100,000 to $150,000.
The "Catskills" is a mountainous resort area located about 3 hours' drive of north of New York city.