The film was initially titled " Kaun Bola" then " I Believe in Angels".
Many actresses including Konkana Sen Sharma and Urvashi Sharma were approached for the lead role.
All the actors have appeared in more than one Rajkumar Hirani directorial.
Remake of Ghost Town.
Arshad Warsi decided to produce the film after he heard Kaber Kaushik's script.