Lance Henriksen was sick during a lot of the filming of this episode, largely due to the fact that he was trying to give up smoking at the time.
This episode was inspired by James Wong's research into the Knights Templar and the Freemasons, two bodies upon which the Millennium Group was modeled.
When listing the American cop shows he learned English from, Detektiv Heim specifically mentions The Commish (1991), which Glen Morgan and James Wong briefly wrote for.