According to writer Crazy Mohan writing Aboorva Sagodharagal was a rehearsal for Michael Madana Kamarajan because with this film, he used fine tune the scenes like crazy, his initial script had only a few dots and crosses.
When Madhan. (kamal) is explaining the money embezzlement happening at his company to Avinashi (Nagesh), he is doing this demo with a Apple Laptop! This being an indian movie released in 1990, this ought to the first time such real life advanced computer is shown on screen if not the first.
Actor Nagesh was partially interested in portraying the thieving grandmother role, and felt he would have taken it to a different level according to Kamal Hassan.
According to actress Khushbu in the pre climax scene when she points the gun the entire group starts moving together, doing the same movement, trying to escape was completely spontaneous and improvised. Stating further in the scene where she somersaults when the grandma pushes her onto the bed was improvised too. She had done it during rehearsal and Kamal Hassan wanted it in the final take.
For the climax scene shot at Mohan studios, it was an engineer who erected the set along with the art director, as it had to be a rocking set, they made a metal platform as the base and raised the wooden set on top of it, doing precise weight balancing. They disassembled the set and took it to Conoor, where they shot the exterior scenes at Dolphin's nose, to match the interior scenes.