Many of the character's names are the same or shortened versions of their real names, such as Amitabh is called Amit, Shabana Azmi is called Shabbo, Neetu Singh is called Neetu, Dev Kumar is called Dev and Shammi Kapoor is called Shamsher.
In this film, Master Tito plays the role of a young Amitabh while Master Ratan plays the role of a young Vinod Khanna. In "Suhaag", also a Manmohan Desai film, Master Ratan plays the role of a young Amitabh while Master Tito plays the younger Shashi Kapoor.
This movie shares a number of similarities with "Zameer" that was released two years earlier. In both movies, Shammi Kapoor and Indirani Mukherjee play husband and wife and in both movies Vinod Khanna is their real son while Amitabh Bachchan is their adopted son.
Sheikh Mukhtar was signed for the film. But he kept throwing his weight around telling Manmohan Desai that he would not ever yell "CUT" during the shooting of his (Sheikh's) scenes. Desai agreed, but Sheikh Mukhtar fled India and went to Pakistan with out any warning. Amjad Khan was signed to replace him.
This film was one of four Manmohan Desai films released in 1977. The other three being "Amar Akbar Anthony", "Dharam-Veer" and "Chacha Bhatija". All four turned out to be massively successful at the box office.
One story doing the rounds was that Rajesh Khanna was offered the film but he kept insisting he play the daku's biological son. Desai did not want this and finally got tired of Khanna'a tantrums. He called Vinod Khanna to report to the muhurat of the film. Vinod arrived on the dayand agreed to do the film without asking what his role was and what the script was.
After Amitabh shows Shammi Kapoor his cigarette lighter which has a built-in camera, the latter jokes that Amitabh must have been watching too many James Bond films. However, this scene has been removed from newer versions of this film for unknown reasons.
Manmohan Desai stated the under water climax scene was hurried and lacked the punch. He wanted to shoot the scene abroad but India's Emergency prevented him to do so. In India he could not do a good job. The submarine built looked okay from inside, but outside looked like crap. He compromised and went ahead with the scene.
Shabana Azmi and Manmohan Desai had a falling out after the film. She kept complaining about her role saying Neetu Singh was given q edge over her. Desai in the print stated he would never work with her again. He stated she was not his cup of tea and too intellectual.