At a special preview of the film Amitabh Bachchan asked to provide narration for the film, saying it reminded him of his time as a struggling actor in Calcutta.
The train Shekhar Rai is riding during the song "Kasto Mazza" is the same one his mother, Sharmila Tagore, was riding in the film Aradhana (1969)
The music that plays everytime the characters of Girish (Sanjay Dutt) and Lolita (Vidya Balan) see each other is actually a small segment taken from the song "Ek Ladki Ko Dekha" from another Vidhu Vinod Chopra film, 1942: A Love Story.
Vidhu Vinod wanted Aamir Khan for Sanjay Dutts role. Aamir Khan refused to play second fiddle to Saif Ali Khan.
Kaisi paheli" from the movie Parineeta composed by Shantanu Moitra is definitely inspired by the Louis Armstrong classic "A kiss to build a dream on.