The man washing the car outside Topher Lomax's house is the director Nick Murphy.
A few minutes into the episode, Reinhart is talking to her ex husband on a bench outside the hospital, and the intercom in the background says "Dr. Blair Dr. Blair Dr. J. Hamilton. This a reference to the Queensrÿche album Operation Mindcrime, where the same page is heard at the beginning of the album while the nurse is looking in on Nicky.
John Simm (Marcus Farrow) & Benedict Wong (DS Ash Chan) also worked together on State of Play (2003) as Cal McCaffrey & Pete Cheng respectively.