Its said that Amitabh Bachchan was in the cast in the lead role of Sawaal . The title was "Aakhree Sawaal". The role then Shashi Kapoor did. At that time Amitabh Bachchan was working in only one film for the same banner, that was his policy at that time and in those days he was completing Kala Pathar and was starting Silsila for the same banner, so that is the reason he couldn't work in Sawaal.
Director Ramesh Talwar was assistant director of Yash Chopra and Ramesh Talwar had directed 2 films for Yash Chopra, Doosra Aadmi & Sawaal.
Yash Chopra had produced 3 films toghether at one time, Silsila, Nakhuda & Sawaal.
Sawaal and Hrishikesh Mukherji Naram Garam were acteress Swaroop Sampat's first films. She signed these 2 films at the same time.
Ramesh Talwar stated when he heard the story of Sawaal he did not like it and did not want to direct the film. It was Yash Chopra who encouraged him to direct the film. Yash told Ramesh to do all kinds of films. Not just emotional ones. The shooting of Sawaal kept getting delayed because Yash Chopra kept using Sanjeev Kumar's Sawaal dates for Silsila .