Dimple Kapadia's voice was dubbed in the film by a dubbing artiste.
Pahlaj Nihalani had signed Javed Sheikh for the film. But a day before the films shooting, he informed Pahlaj he did not get the required work permit. Pahlaj then had to sign Chunky Pandey on short notice. To make him suitable opposite Dimple they had Chunky wear a mustache.
Chunky felt the film flopped because the audience did not accept his pairing with Dimple.
Gunahon Ka Faisla was made after Paap Ki Duniya, made by same Producer and Director.
After Ilzaam, Aag Hi Aag Hi Aag & Paap Ki Duniya, All were Directed by Shibu Mittra for Producer Pahaj Nihalani. Gunahon Ka Faisla was the last film Shibu Mittra made for Pahlej Nihalani.