Poppy Montgomery's character, Samantha Spade, is a play on the name of another famous fiction detective: Sam Spade. Sam Spade was created by famed novelist Dashiell Hammett in his book 'The Maltese Falcon' (and has been played on screen by Humphrey Bogart and Ricardo Cortez).
There was no way I was going to leave that boy to die.
Paula Van Doren: You made your own bed on this, Jack.)
Jack Malone: You know, I used to think that this job was worth it. Giving up my life, my family, my friends, but today I almost sold my soul, and you know what? Not worth ...
Since the inception of the agency, FBI agents travel in pairs when interview subjects. This is both to have a witness to the interview as well as for protection in case unexpected things occur. Multiple times during the show, single agents are shown talking with subjects alone, even in their homes or places unfamiliar to the agents.
Actual missing-person reports are posted at the end of each episode.