Each of the main characters has a colour which can be seen in their clothes and possessions. Oliver is blue, Jordana is red, Jill is yellow, Lloyd is brown and Graham is black. As Oliver gets to know Jordana more and more red sneaks into his palette.
Alex Turner, lead singer of the British band "Arctic Monkeys", provided original songs for the film, one of which, "Piledriver Waltz", ended up on their 2011 album "Suck It And See".
Towards the beginning of the film's prologue, Oliver is imagining what would happen if he were to die. In the daydream, Oliver refers to the man on the PA system as "Mr. Dunthorne". This is most likely a reference to Joe Dunthorne, the author of the novel which the movie is based upon.
There is a fake movie poster on Oliver's bedroom wall entitled "His Death Is Red". Jordana is represented by the colour red, throughout. It may refer to the death of his innocence, his childhood or his frequently imagined death.
This film is a British-American venture. However, despite this fact, Ben Stiller is the only American actor in the entire cast.