The name of the movie is misleading because there is no Rainbow colony in Chennai where the movie takes place. The movie was shot in K.K.Nagar, Chennai.
The directors favorite show is Os Simpsons (1989). Homer Simpson is Safety Inspector for Sector 7-G of the Springfield Nuclear Power Plant.
Yuvan Shankar Raja, who received Filmfare Award for his work in this film remains the youngest ever composer to win it. He won it at the age of 25.
In the opening film credits you can read the phrasing: "Based on a True Story".