The cyclist who knocks on the car window at the beginning is the real Adam Kay
In the club, PJ quips about Ben Whishaw's character committing mass murder and he replies that he'd "do that". Ben Whishaw's breakthrough performance was in 2006 as Jean-Baptiste Grenouille, the anti-hero with several bodies to his credit in the film adaptation of Patrick Suskind's best-selling German novel, Das Parfum (Perfume).