Amitabh Bachchan had a 15 page dialogue that he kept practicing on the sets. But during rehearsals, Amitabh kept mugging up his lines and forgetting a lot of words. That is when Sunil Dutt decided to scrap Amitabh's dialogues and make his character mute.
Amitabh Bachchan was new to the industry and was seeking film roles. He approached Sunil Dutt's wife Nargis who decided to give him a chance and suggested his name to her husband.
Reshma Aur Shera is a classic film, it was ahead of its time and was appreciated a lot when released, but the film had put Sunil Dutt in huge losses and financely he suffered a lot. His position became better after the release of Sultan Ahmed's Heera. Later Sunil Dutt made commercial films only like Nehla Pe Dehla, Rocky etc.
After the film flopped, Sunil Dutt had to pawn his bungalow and sell all his luxurious cars. Sunil Dutt was seen taking the bus to several studios at one point .it was when Sunil signed several dacoit films that he was able to pull himself out of severe debt.
In 2019 Amitabh Bachchan reveled in KBC that while shy for the film in Rajasthan.He observed that people in that region didn't knew what is rain.