Praveen Babi's voice is dubbed by a dubbing artiste in the film. She had dissapeared to America at the time.
Rajesh Roshan sampled the "La Cucaracha" tune , which is a traditional Spanish folk corrido that became popular in Mexico during the Mexican Revolution. He used the tune for the song "Tune Abhi Dekha Nahin". He sampled it in the part "Jo Soche,Jo Chahe Woh Karke "...It has the same rhythm.
The title sequence of the film had animated versions of Amitabh Bachchan and Shashi Kapoor, and was done in the visual style of 'The Pink Panther'.
The tune of the song "Prem Se Hum Ko Jeene Do" is actually the tune of the old English nursery rhyme "Mary Had A Little Lamb".
When the producers initially approached Amitabh to do this film, he refused because he didn't like the script very much. The producers then hired Rakesh Kumar as the director and he convinced Amitabh to sign the film. Rakesh Kumar was a friend of Amitabh and the two had previously worked together in Khoon Pasina and Mr. Natwarlal.