The driver and the conductor in this movie are named Rajesh and Khanna respectively. This was a tribute to the super-stardom of Rajesh Khanna who was the toast of Hindi cinema when the movie was released.
Aruna Irani was the only heroine who agreed to work with Amitabh Bachchan as he wasn't as popular those days.
After watching Amitabh Bachchan in this Salim Javed offered him Zanjeer 1973 and the rest is history.
Amitabh Bachchan pressured Shatrughan Sinha to do the villain's role, although he wasn't keen on doing the it. He agreed only because of their close friendship from their struggling days.
Mehmood was producing Bombay to Goa (1972) and wanted a protagonist for it. He was brain storming with his colleagues so as to who should be cast for the lead role when a certain somebody entered the room. He had met him only once before. He saw him and suggested to his colleagues that why don't we cast this "Lamba Ghoda" (Tall Horse). His colleagues agreed later on and the role went to Amitabh Bachchan.