This film's story is set in Hamburg. Source novel author John le Carré worked for British intelligence's MI5 & MI6 during the 1950s and 1960s and worked in both Berlin and Hamburg. Le Carré was in Berlin when the Berlin Wall was being constructed. In Hamburg, Le Carré has worked as both a consul and as an agent.
One of the producers of this film, Stephen Cornwell, is the son of John le Carré, author of the source book A Most Wanted Man and many other spy novels. This picture is their first collaboration ever. John le Carré's real birth name is David Cornwell (full name David John Moore Cornwell).
John le Carré's source novel 'A Most Wanted Man' is based on the real life of Murat Kurnaz, a Muslim Turkish citizen and legal resident of Germany who was arrested in Pakistan in late 2001 and with the German government's awareness incarcerated by extraordinary rendition (aka irregular rendition) at US military base in Kandahar, Afghanistan and in the Guantanamo Bay detention camp at Guantanamo Bay Naval Base, Cuba for five years.
The car Guenther Bachman drives in this movie, the W-126 S Mercedes, has a typical eighties' (W126 '79-'91) green metallic color. Towards the end, the Merc seems to have 'lost' a dent in a fender as well as to have changed color to metallic blue. Knowing the photographic skills of Anton Corbijn, this may be a matter of lighting.