It is the first Hindi film for which the doors of the Victorian-era Writers' Buildings were opened for shooting.
Amitabh Bachchan recorded a version of song "Kyun Re" for the film.The song depicts the pain of a grandpa who has lost his granddaughter.
Sabyasachi Chakraborty and Vidya Balan appear together after 11 years since they worked in Parineeta (2005).
The media had reported that the film was titled "Kerala" when the film was announced.
Amitabh Bachchan and Sabyasachi Chakraborty appear together after 12 years since they worked in Khakee (2004).
Amitabh Bachchan's name in this movie is John. He previously had his character name John in the film Naseeb (1981).
Sujoy Ghosh was going to direct the film when it was titled " Badla". Naseerruddin Shah was to do the role eventually done by Nawazuddin Siddique.