1.The basic structure had some more characters that were cut down – originally there used to be two kids Kavya (13) and Sanjay (5) – the prototype of the 2 and a half year old Ananth (Master Aryan in the movie), and there was another child ghost too, supposed to be a dead sister of the protagonist.
2. Nandha"s character was originally named Rajaram, who was not into leather exports, but was pirating CDs of latest Tamil movies at his dwindling business of multimedia training centre. He had left his home since he was prodigal, and his parents had died heartbroken later, not in a car accident.
3. Revathi"s character (Chaya Singh in the movie) was originally named Vidya.
4. Kalai Arasi was not as lovable as it is in the movie now. There was a sense of disturbing eeriness and secrecy surrounding that character.
5. The setting was originally at Pudukkottai, later it was changed to Nagercoil.
6. The first treatment note for the script had the kid Ananth radiant with psychic current. The moment he steps into the house his visions grow entertainingly out of control.
7. He is the first one to see the activity and the presence in the house. In the first draft, it was designed like spirits entering and exiting the body of Ananth who keeps questioning like: When we were alive whatever we did was normal and good. When we are dead, how come the same good actions are despised?
8. Originally the writers didn"t want to show the grand parents" identities as ghosts. Later as they thought it would result in more scariness, they modified the script literally in an entertaining manner.
9. The first working title was Bhayam and was renamed as Anantharpurathu Veedu as Naga had the House as the backdrop throughout the film.
10. Naga and screenwriter Sharath Haridasan were ignited with this concept from a poster that portrayed a boy departing from the house and the couple looking through the window.