Filmmaker Anubhav Sinha says he and his team wanted a lot of realism in "Mulk" and so its actor Prateik Babbar, who plays a misguided youth in the upcoming film, had to research on terrorist David Headley.

His co-stars Taapsee Pannu, Rishi Kapoor and Ashutosh Rana also underwent intense lessons for the courtroom drama. Ashutosh and Taapsee, who play public prosecutor and defence lawyer respectively, were trained by retired high court judge Nadeem Siddiqi for their courtroom scenes to ensure the legal system was aptly represented.