The original script for the sequel was supposed to be based on lawyers, as a follow up to the doctor story in Munnabhai 1. Raju Hirani was not happy with the script and continued working for 2 years to develop the perfect sequel. Few episodes regarding lawyers were anyway incorporated in this movie.
The scene in front of Mahatma Gandhi Library, Munna(Sanjay Dutt) and Circuit(Arshad Warsi) discuss about another radio jockey named Anupama Chopra who talks a lot about Shah Rukh Khan. In real life Anupama Chopra is a famous journalist, film critic. Anupama Chopra is also wife of the producer Vidhu Vinod Chopra and is the author of the book King of Bollywood : Shah Rukh Khan and the seductive world of Indian cinema.
The radio jockey in the movie was modeled after real-life radio jockey Mallishka. The lead actress Vidya Balan spent time with Mallishka, who gained popularity with the now defunct Win 94.3 FM channel in Mumbai, in order to get the right inflection and attitude of a radio jockey.