Leena Chandavarkar brother Aneel was working as a production assistant in the film. After a heavy argument with Kishore Kumar , Aneel was booted out of the film. Many speculate this lead to Aneel's suicide.
When Kishore Kumar passed away, he had almost completed the shooting of the whole film, only some minor scenes were to be shot. So then Rajesh Khanna helped Amit Kumar to complete the shooting and the dubbing and the film was released.
Kishore Kumar wanted Amitabh Bachchan to do the role which then Rajesh Khanna did. This film took about 5 years time to be made. When this film started Kishor Kumar son Sumeet was a baby and then he was showed as a 5 year boy. In the film it showed Sumeet as a baby than a 5 year boy.
Kishore Kumar had written the story, screenplay, dialogues, songs, he also composed the music for this film and also directed Mamta Ki Chhaon Mein. He was one of The Genius.