This film holds the notable accolade of managing to film at Piccadilly Circus for longer than any other production ever, with several night shoots having been filmed at the world-famous location.
Luther is referred to by police scanner as a "IC3 male"; IC is police-speak for identifying the ethnicity of a person. IC is "identity code". The number following identifies the ethnicity; IC1 is White (Northern) European, IC2 is Dark European (Mediterranean/Hispanic), IC3 is Afro-Caribbean, IC4 is Asian (South Asian), IC5 is East/Southeast Asian, IC6 Arab/North African, IC7 or 0 is Unknown.
During a scene in a fancy bar or restaurant, Luther asks the barkeeper to recommend a drink after a long day. The barkeeper suggests a Martini, to which Luther replies No. Luther orders sparkling water instead, an obvious nod to 007's signature drink.
The language David Robey (played by Andy Serkis) speaks with his employees, is Estonian (with an accent).
Idris Elba and Andy Serkis previously both appeared in Avengers: Age of Ultron (2015), as Heimdall and Ulysses Klaue respectively.