Michael Hai Toh Cycle Hai was supposed to be a two hero song.Kishore Kumar and Mala Sinha alongside I.S Johar and Leela Chitnis sung by Kishore Kumar , Manna Dey and Asha Bhosle.But I.S Johar wasn't well during the shooting of the song and director decided to wait for sometime I.S Johar took sometime to recover and the song was then only shot with Kishore Kumar and Mala Sinha with to male singers voice for one actor.
Asha Parekh was to do the film but was replaced by Mala Sinha .
Some of Kishore Kumar and Pran's dialogues are dubbed by I.S Johar
The main characters of the movie has their names based on their real names. i.e: Kishore Kumar's name in the movie is also Kishore Kumar. Same with Pran I.S Johar and Mala Sinha's