To make Boman Irani (a Parsi) understand the character of a Punjabi property dealer better, the director showed him the real footage (captured on hidden cameras) of how Delhi property dealers behaved .
The role of Mr.Khosla was first offered to Paresh Rawal, but he turned it down. The role later went to Anupam Kher.
Cherry ('Parvin Dabbas') wears an IIT t-shirt once in the film, though never shown in the movie whether he studied there or not. In Monsoon Wedding (2001), Parvin Dabbas's previous film, he tells his fiancé at a tea shop that he used to come there during the days he studied at IIT, both films being set in New Delhi.
Nikki is shown to be a huge fan of Vivek Oberoi from the very beginning as her room is adorned by the actor's posters.