Irrfan Khan was diagnosed with tumor during the film making.
Irfan Khan read the script in two hours and gave his nod for the film.
Film released few days after Irfan Khan disclosed that he is suffering a rare tumor.He wasn't available for the films Premiere as he had to leave for US for his treatment.
Film was earlier changed from Blackmail to Raita and then again changed to Blackmail.
Irfan Khan and Pardyuman Singh are named Dev and Anand which marks a tribute to legend actor Dev Anand.