The original title of the film was "Kyon! Ho Gaya Na Pyar..." But the director felt the word pyar (love) was very common and used too often in Hindi films. So he restricted his movies title, by removing the word pyar from the movie.
The real life relationship of the main lead 'Vivek Oberoi' and Aishwarya Rai Bachchan, has given the film the extra publicity, as this is a very much talked issue currently within the Bollywood industry and its fans.
Originally UTV were planning on producing the film, they backed off just three weeks before the film was set to roll. 'Vivek Oberoi' suggested to the director that he meets up with producer Boney Kapoor, who showed faith in a debutant director and decided to produce the film.
While in production the movie got delayed because of the accidents the main lead had to face on the sets of their other movies, 'Vivek Oberoi' in Yuva (2004) and Aishwarya Rai Bachchan in Khakee (2004)
Director Samir Karnik initially went to see Anil Mehta on the set of Saathiya to ask him to shoot his debut feature. On the set he met Vivek Oberoi and told him about his idea for a movie. Sudeep Chatterjee was signed on as director of photography.
The reason why Amar Singh (politician) was thanked in the opening credits of the movie was because while Boney Kapoor was making Pukar (2000) he fell into financial problems and Amar Singh guided him. Boney Kapoor decided to thank him in all his movies for his unforgettable assistance in times of needs.