When Red (James Spader) briefs the FBI on Madeline Pratt (Jennifer Ehle), the camera pans across several screens of surveillance photographs, supposedly showing Madeline at various charitable and political events. The last one appears to depict Madeline dining and conversing with Rafael Edward "Ted" Cruz, a Republican and the junior U.S. Senator from Texas.
Red mentions Tegucigalpa. It's the capital of Honduras. Its original name when founded in 1578 was Real de Minas de San Miguel de Heredia de Tegucigalpa.
Diego Klattenhoff (Donald Ressler) and Jason Butler Harner (Walter Gary Martin) also worked together on Game On (2013) as Mike Faber and Paul Franklin respectively.
Jennifer Ehle became a popular actress for her portrayal of a character named "Elizabeth" in Pride and Prejudice (1995).