There was stories in the media of how Rajesh Khanna would make Dharmendra wait endlessly on the sets. Then when Khanna would arrive he would excuse himself to meet visitors. One day Khanna did this and went to his makeup room. Dharmendra got mad and followed him . By the time Khanna had arrived at his make up room, a friend of Khanna had already warned him of a angry Dharmendra on his way. Rajesh Khanna quickly took off and left the studio before Dharamendra could make it to Khanna's make up room.
Jaya Pradha's voice is dubbed by a dubbing artiste.
It was said that Rajesh Khanna was to play the father role only, the son role was to be played by another actor. But after success of Souten, the makers decided Rajesh Khanna should play dual role in the movie father and son.
Raam- Laxman had composed music for Humse Badkar Kaun & Bezubaan. The same producer made this movie and had signed Raam-Laxman for Dharam Air Qanoon. But later Raam-Laxman left the project and then Kalyanji-Anandji composed the music for the film. Later in 1990s Ram-Laxman composed music for 100 Days & Muskaharat for the same producer.
At that time Rajesh Khanna and Jaya Prada was hit pair and were working together in many movies.