The scene in which Amitabh gives a speech on stage (Prior to O Saathi Re) was written by Kader Khan. He based the dialogues on his own personal pain in life. When Kader wrote the scene, it ended up being 16 long pages. Kader delivered the dialogues to Prakash Mehra. When Amitabh saw the 16 pages, he refused to do the scene. Amitabh felt it was too long and there was no way he could remember and recite the entire dialogues. Prakasn Mehra also agreed that it was too long. Later Amitabh sent his car out to pick up Kader Khan. When the two met, Amitabh told Kader there was no way he was going to do the scene with 16 pages of dialogues. Kader then took the sheet and did it himself with tears in his eyes. He told Amitabh the importance of the words in the scene.Amitabh was speechless. He got hugged Kader Khan and agreed to do the scene as it was written.
This was Amitabh Bachchan and Vinod Khanna's final movie together, ending one of the greatest duos in Bollywood. Before Vinod Khanna's passing, he worked with Bachchan's son Abhishek in Players in 2012.
Asrani was to play the role of Pyarelal. He was stuck at another movie set due to the heavy rains. Prakash Mehra' assistant director Ram Sethi did the role at the last minute and the charactor Pyarelal became famous and memorable for more than 35 years now.
There is the story twist in the film, Amjad Khan wants Rekha but she wants Amitabh Bachchan, but Amitabh wants Rakhee and Rakhee wants Vinod Khanna