Jennifer Garner, Ron Rifkin, Michael Vartan, Bradley Cooper, and Victor Garber are the only people to appear in every episode of Season 1.
Sydney is once again chained to a chair in a Taipei storeroom like in Truth Be Told (2001). In the first episode, she dyed her hair red, in this one, it's blue(ish).
This episode went straight from the recap to the opening credits which is unusual as usually a fresh new scene is shown before they cut to the credits.
Number 47: Haladki reveals that the battery is in the room 47 of an underground lab of Pang Pharmaceuticals in Taipei.
Jennifer Garner, Ron Rifkin, Michael Vartan, Bradley Cooper, Merrin Dungey, Carl Lumbly, Kevin Weisman and Victor Garber provide DVD commentary for this episode.