Writer Noel Clarke had previously played Rose's boyfriend Mickey in the first two seasons of the revitalized Doctor Who (2005). Clarke is an accomplished writer-director as well as being an actor, having written Kidulthood (2006) and written and directed Adulthood (2008) and 4.3.2.1. (2010).
Alex Hassell auditioned for the part of Mark on a Thursday and was on set playing the part by Monday.
At the warehouse the dead man's phone has a peculiar ringtone that Captain Jack would never use. The ringtone was one of the Crazy Frog annoying things. After becoming a viral internet sensation in 2003 the Crazy Frog was marketed and its ringtones and albums were so heavily and ubiquitously advertised that folks started complaining to the UK regulatory agencies.
This episode takes place in 2008.
Dan Hodges was born on January 21, 1979.