When Ed Westwick was first offered his role in this film, he turned it down because the scheduled dates for shooting conflicted with his exams at school and he had no idea who Anthony Minghella was, but his father told him to reply to the email and tell him he was available.
The techniques used to burgle Green Effect come from parkour, a physical discipline and recreational activity of French origin whose practitioners are called traceurs. Sometimes confused with free running, a related discipline derived from parkour, the art, as it is called by some practitioners, has gained in popularity in urban areas, particularly in Europe, during the early 21st century.
When Will drinks the coffee the sex worker brings to him at midnight, "PRET" can be seen on the coffee-cup sleeve. However, the Pret A Manger at King's Cross closes at 8pm.