Well before he greenlit Batla House, filmmaker Nikkhil Advani knew that the challenge would lie in depicting the controversial 2008 police encounter without bias. The director reveals that the team dedicated four years to research before taking the John Abraham-starrer on floors.

Besides studying the different conspiracy theories that emerged around the encounter that was planned by Delhi Police Special Cell DCP Sanjeev Kumar Yadav, Advani and writer Ritesh Shah also pored over the proceedings of the judicial enquiry that was set up to probe allegations of a fake encounter.