According to the original Clockwork uniform system, the Summerland crew's dangerousn/colour code in the institution is designated as follows: Melanie & Ptonomy are red (high risk of violence) Cary and David are yellow (mild to moderate risk of violence) Syd and Kerry are white (no risk of violence).
The scene when David is lying in Syd's bed mirrors the scene in episode one when Syd is lying in his bed.