Vishnuvardhan had actually scripted a completely different script for Arrambam it was when A.N. Balakrishnan and D. Suresh came in board for story writing that a completely new story had come which u actually see in the movie.
A short teaser without the movie's title of this film was released on Ajith Kumar's birthday and the video gained 1.5 million views in just 2 days.
During preproduction, it was rumoured that aarya was the brother of Ajith in the film. But in the film, they were not even friends.