Dr. Kiem wonders why Asian women are always depicted as geishas or Suzie Wong. France Nuyen (Dr. Kiem) was originally cast as the title character in The World of Suzie Wong (1960) but she was replaced by Nancy Kwan.
A former colleague that Dr. Craig meets in jail is Robin Baskins, a play on the name of the Baskin Robbins ice cream company.
When Dr. Craig and John Doe #6 are talking at the elevators towards the end of the episode, Craig pushes the up button but after a slight pause the down button lights up.