The film was a surprise hit for Dev Anand . Dev's last few films had flopped. To thank director Pramod Chakraborthy Dev Anand arrived at Pramod's apartment building. But on this day, the elevator was broken. Pramod lived on the top 20th floor. Dev Anand so happy and grateful of the film being a hit, ran up all the stairs to the 20 th floor. Pramod was shocked Dev had done this for him.
Derek Scott's instrumental "Sounds Unusual" from the album Sounds Unusual, was played in the scene with Asrani and Paintal in Chandi Sona . The instrumental song was also recreated and sampled by Rahul Dev Burman for the film's title music. Burman would later recreate the same tune as background music in Dev Anand's Warrant. The scene where Dev dresses up as a doctor in the hospital.
Did you know 'ruk jaana o jaana' from Warrant was initially planned to be picturised on Rishi Kapoor. During the music recording of the song, when Panchamda was giving final touches in the presence of Rishi Kapoor, Dev Anand entered the studio. He was so impressed with the song that he actually snatched the song from RDB and used it for Warrant.
Warrant has entire clips copy pasted from You Only Live Twice including the helicopter descending into a lake which suddenly opens up to reveal the villains den. Complete copy paste of shots..Pran asks Jagdish Raj to get his "Special helicopter" and the "Little Nellie" scenes from You Only Lice Twice are copy pasted.
Pran who played Dev Anand's father in the film was 3 years older to him in real life.