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.
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.
When Annabel walks into the bar, greets some friends, and meets Günther, her hair is gathered at the back of her head in thick locks. A short while later, when she meets with Tommy at The Atlantic hotel, there is much less hair drawn to the back of Annabel's head.
Günther Bachmann was alone and pondering the situation while sipping an alcoholic beverage over ice. The sound editor overdubbed that of a man slurping or taking a large swallow of his beverage while the sound of the ice cubes clinking with the glass is incompatible with the small, melted pieces of ice that can be observed in the glass.
During the first meeting between Annabel Richter and Thomas Brue, Richter hands Brue a hand-written an account number on a piece of paper that was torn from her (Daytimer's) personal organizer. The sound editor overdubbed the sound of a perforated piece of paper being removed from a pad. When the note is seen by the audience, it is a piece of paper that had been bound by a hole punch and would have made a different sound when torn from it's source.