David Anders does not appear in this episode.
Number 47: The time shown on Sydney's brain monitor in Dr. Brezzel's apartment is 13:47:15.
Number 47: During Sydney's flashbacks, the room she was wheeled into, while unconscious, was numbered 47.
The normal opening is not used in this episode, the cast appears during the episode.
Dr. Brezzel: (about Sydney) She's in a tangent.
Kaya: I was in a tangent once.
Jack: How nice for you.
Jack: I used to think you didn't have much of a spine.
Michael: Has that assessment changed at all?
Jack: No. (smiles)
Sydney: What if what we're looking for isn't metal?
Jack: Then we're screwed - not an unfamiliar situation.