Dev Anand and Guru Dutt were friends when they struggled to get a break in films, and had promised each other that Dev would give Guru Dutt a film to direct (which he did with Baazi) and Guru Dutt would cast Dev as a hero and direct him. As Guru Dutt did not direct C.I.D. he could fulfil only half his promise.
Guru Dutt had spotted Waheeda Rehman in a Telugu movie and cast her in Pyaasa, but gave her a key supporting role in C.I.D. to prepare her for Pyaasa.
Guru Dutt had reportedly gifted Raj Khosla a swanky foreign car after the success of CID.
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