Shatrughan Sinha idolized the great showman Raj Kapoor. It was because of Raj Kapoor he became a actor. But an incident with Prithviraj Kapoor ruined it all. During his film institute days, Prithviraj Kapoor visited the institute to have a talk with the students and sign autographs. During a conversation with the students,Prithviraj let slip some very foul rude curse words. This put off Shatrughan and he was offended. He later bashed Prithviiraj in interviews saying stars should behave properly around fans and watch their language. Shatrughan would constantly talk about this incident non stop. Finally Shammi Kapoor retaliated. One day during the shooting of Khaan Dost at R.K.Studio all hell broke loose. Shammi Kapoor arrived on the sets and confronted Shatrughan about all the comments. This led to a huge argument and finally Shammi Kapoor grabbed Shatrughan by the collar and dragged him all the way outside the gates of the R.K. Studio . Shammi slapped Shatrughan and threw him out. Shammi then instructed the guards to never let Shatrughan ever enter R.K. studios !. Better sense prevailed and Shatrughan later apologized for his words.
Subhash Ghai and B.B. Bhalla were upset with director Dulal Guha. They felt he tampered with their script. The story was about the Khaan who meets the Havaldaar. But they argued that Dulal Guha made it the story of the havaldaar instead. After being confronted about this,Dulal brushed the matter up. Shatrughan claimed the film flopped because no one could relate to any of the characters. The havaldaar was too innocent for that generation to accept him. Shatrughan's character was neither a hero or villian. Then Dulal Guha spread the story that Shatrughan kept interfering and demanding more footage. Dulal Guha lost hope on the film and called it a dead horse.
Dulal Guha left the film midway. Subhash Ghai finished the film.