Amitabh Bachchan had suffered major injury while shooting for the film had hurt his rib cage and was on bed rest for sometime.
Amitabh Bachchan and Kamal Hassan to work together after 39 years since Geraftaar (1985).
The most expensive Indian film in history.
With the film being shot in the Hindi and Telugu languages separately, this marks Kamal Haasan's return to filming in Hindi 6 years after his directional, Vishwaroopam 2 (2018). In Telugu, this marks 18 years since Unnaipol Oruvan (2009) 's Telugu version, "Eenadu" where he last delivered his dialogues in Telugu.
Film was earlier titled Project K.