Did You Know?
When Prof. Sinha is first talking to his students in the class, on the blackboard behind him are displayed formulae from varied branches of science - mathematics, chemistry etc. Prominently visible is "Boney's Law of Time-Space Continuum". Boney Kapoor is the producer of the movie.
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The film had originally been written for Rajesh Khanna in the lead role but he rejected it because he felt the "invisibility" factor was the main hero of the film. After some script changes by Shekar and Boney Kapoor, Anil Kapoor was cast in his place. Kishore Kumar sang the songs thinking it would be picturised on Rajesh Khanna and even Laxmikant Pyarelal were under the same impression.
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Amitabh Bachchan was offered to play the role of Mr India but he declined as he was into politics and was not doing many movies. Shekar Kapur wanted Anupam Kher to play the role of Mogambo but then switched to Amrish Puri as he wanted someone who looked scary.
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