In the scene when Audrey draws Henderson's secretary away from her desk, she uses the fake name "Jane Espenson." Espenson was a staff writer on "Buffy the Vampire Slayer (1997), Angel (1999), and Firefly (2002), working with fellow writer David Fury, who is a writer and co-exec producer on "24."
When Jack and Henderson reach the Development Bunker, the two begin to spout about Henderson's dirty activity at CTU. Henderson claims that he was framed and that it was either George Mason, Nina Meyers or some unknown party. This conversation is the first mention of George Mason since the aftermath of his death in Season 2 and the final mention of him for the duration of the series.