When asked why he cast newcomer Abhay Deol, director Anurag Kashyap simply replied, "He has turned out to be one of the best. When everybody wants to be a Hero, he plays the character.
When asked what was the significance of the three guys (the Twilight Players), shown in the movie from time to time, Anurag Kashyap answered, "No significance. They were just there witnessing the story. Like Sanjay in the Mahabharat."
Director Danny Boyle helped Anurag Kashyap with the 'tripping away' scenes by introducing him to a special camera he (Boyle) had got from Holland. This let Kashyap show whats going on inside characters mind during the drug shots without actually showing drugs.
The MMS video of Chanda when she was a minor Delhi school girl is inspired by the real life MMS video of a minor Delhi school girl which caused a big scandal in India in 2004. Just like Chanda's father in the movie, the real girl's father killed himself.
The location portrayed as Chandigarh Airport (where Dev arrives from London) in the movie is actually Chandigarh Railway Station.
Anurag Kashyap: One of Chanda's first clients. The guy whose coat Chanda takes off during the "Paayaliya" song sequence.