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.
The language David Robey (played by Andy Serkis) speaks with his employees, is Estonian (with an accent).
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.
Idris Elba and Andy Serkis previously both appeared in Avengers: Age of Ultron (2015), as Heimdall and Ulysses Klaue respectively.