The film was originally titled after the famous con artist Natwarlal, but as he was offended by this his lawyer sent a legal notice to the producers and later the film was re-titled Mr. Natwarlal only days before its release.
This was the first time superstar Amitabh Bachchan sang a playback song for a movie. "Mere Paas Aao" was the first of many songs of a movie sung by him.