John Abraham was originally set to play the role of Arjun Rampal, but he could not do so since the dates of Ravi Chopra's 'Babul' had gone haywire due to Bachchan's health problem. So the role was later performed by Arjun Rampal.
Reema Kagti initially approached her mentor and director Farhan Akhtar for the role being played by Abhay Deol. However, Farhan couldn't play the part as he was busy with "Don" starring SRK.
Not many people know that Vikram Chatwal who plays the role of Bunty opposite actress Sandhya Mridul and calls himself "her better half" in the film's trailer is in real-life, an affluent and down-to-earth wealthy Manhattan socialite, having led life in the fast lane. He is a hotelier with Indian roots (and reportedly very close to the Clinton family), and is even rumored to have been "good friends" with supermodels like Gisele Bundchen and Kate Moss.
Abhay Deol and Minissha Lamba became very good friends during the shoot of. There were rumors that he had a crush on her, but both of them dismissed the allegation laughingly. But Abhay admitted, "Minissha is such a lightweight that made it easier for me to do the tango song ( Pyaar Ki Ek Kahani...) with her in the film.
Shilpa Shetty signed the film as she wanted to work with John Abraham.When John opted out, Shilpa lost interest in the film. She was later replaced by Diya Mirza.