Heath Ledger was the director's only choice for the role of Dan.
The man who gives Dan and Candy the milk cartons is Luke Davies, the author of the novel "Candy" the movie is based on.
In an interview, Heath Ledger discussed using his own cigarette addiction as a means to understand heroin addiction for this film.
Movie is divided into chapters of Heaven, Earth, and Hell.
Heath Ledger, the main star, would later tragically die of drug toxicity from an accidental prescription drug overdose for insomnia.