Trivia

Amitabh Bachchan gave a screen test for a film on the sets of Sajan. This was before Bachchan had signed any film. The screen test was arranged by Nargis Dutt.

Shatrughan Sinha made his debut in a small role. He stopped talking to star Asha Parekh because of a misunderstanding, and he continued to ignore her in their next film together Heera (1973). Many years later, he felt that his behavior was immature and recommended her to an important post. She called to thank him and they started talking again, and he said that she was "very gracious about it". In 2017, he attended the launch of her memoir "The Hit Girl".

The Hindi films "Sajan" (1969), "Pasand Apni Apni" (1983) and "Ghajini" (2008), Jhoota Kahin Ka (1979) and the Malayalam film "Aram + Aram = Kinnaram" (1985) also used similar plotlines.

The plot of the Sajan (1969) romance between Manoj Kumar and Asha Parekh's characters shown in the first half of this film was originally used in the British musical comedy "Happy Go Lovely" (1951). The Hindi films "Jhoota Kahin Ka" (1979), "Pasand Apni Apni" (1983), and "Ghajini" (2008), and the Malayalam film "Aram + Aram = Kinnaram" (1985) also used similar plotlines. The film's second half was inspired by Alec Coppel's play "I Killed the Count" (1937).

Shatrughan Sinha stated ' I started from zero to become a hero. Saajan was my first film. I was practically a junior artiste in the film. I appreciate Mohan Segal's gesture of giving me a police man's role. I was standing out of the frame most of the time. I shared my make up room with a junior artiste who would throw me out to take a nap daily. Asha Parekh and I had some tiffs. We still do not talk to each other. I also wonder why Manoj Kumar who was earning in lakhs and lakhs was making the producer's buy his cigarettes's every day".