Kangana Ranaut is shown smoking cigarettes in the film. In real life she is a heavy chain smoker.
Anurag Basu found Kangana at a hotel and narrated the script.
Kangana Ranaut made debut in this film.
Pakistani actress Meera's sister Aqsa Rubab was in Mumbai and auditioned for the lead role.
John Abraham and Sanjay Dutt were considered for roles in this movie.
I'n'Stine/ALxl song "Born to fight" sampled the song "Bheegi Bheegi".
Mallika Sherawat was the first choice for the role, but she quoted a very high price after the success of Murder. This caused the Bhatt's to distance themselves from Mallika. They then decided to launch a new face.
Actress Chitrangada Singh was offered to play the role of Simran in the movie, But later she denied the role. And the offer went to Kangana Ranaut.
Pakistani cricket player, Shoaib Akhtar, was offered a role in this movie but turned it down.
Irrfan Khan was considered for Shiney Ahuja's role.
Before casting in the movie, Mahesh Bhatt claimed the character of Simran may not be appropriate for Kangana Ranaut, because she was too young for the role.
Rumored to be based on the life of real life gangster Abu Salim and Bollywood actress Monica Bedi. However the film's director has claimed that the film is not based on any real life persons or incidents.
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