Bachna Ae Haseeno - Production

Production

In April 2007, sources indicated that director Siddharth Anand had signed for the main lead in his next film. However, after indicating that the news was "mere speculation" and "absolutely untrue," he later confirmed that Kapoor was starring in his film.

The director was in talks with actresses Preity Zinta, Bipasha Basu, Deepika Padukone and Amrita Rao for the roles in question but indicated that "it wouldn't be right to reveal their names till we sign them on the dotted line." In June 2007, Katrina Kaif and Deepika Padukone were finalised to play two of leading ladies, but the former's role was later removed due to the film's story becoming too long. Actress Amrita Rao was considered to play one of the leading ladies but opted out.

The heroines share very limited time on screen together and therefore most of their parts were filmed separately. Deepika Padukone's portions were filmed in Sydney, Australia while the song "Khuda Jaane" was shot at locations in Italy, including Venice and Capri. Minissha Lamba's portions, inspired by Yash Chopra's Dilwale Dulhania Le Jayenge, were filmed in the similar locales of Amritsar and Switzerland. Bipasha Basu's portions were filmed in Mumbai, India and Capri, Italy. Ranbir Kapoor's look in the film was styled by Aki Narula, which changed with time. In title track Ranbir had at least 10 wardrobe changes in one shot. Though he found styling for three lead actresses' characters exciting and challenging, as all play different types who enter into Ranbir's life at different times. So he ensured that the styling was unique without any overlapping.

Continuing the tradition of showcasing the first look of their upcoming films with their latest release, Yash Raj Films showcased the first trailer of the film on 25 April 2008 with the release of Vijay Krishna Acharya's Tashan and a second trailer was shown on 27 June 2008 with the release of Kunal Kohli's Thoda Pyaar Thoda Magic. Yash Raj Films usually does not spend much money on promotion. However, it made an exception with Bachna Ae Haseeno. Instead of the usual promotion 2–3 weeks before a movie release, the production house planned a new strategy with promotion over two months.

Since two of the film's characters work for Microsoft Game Studios, plenty of video games released by them are referenced. In addition, nearly all of the movies referenced are releases from Yash Raj Films, with the notable exception of Hum Kisise Kum Naheen (1977).