The old lady who was paired against Lal, the boy who owns the horse and few other Oldman in the police station scenes are not professional artists. They're actually the villagers from where the movie was shot.
According to the native tradition that exists in southern rural parts of Tamil Nadu, young girls or woman who lose their life before getting married are considered equal to god. The masked girl seen in various parts of the movie is one such representation.
Fans of actor Sivaji Ganesan wrote a letter to the film's producer and asked for the title of the film to be changed, since Sivaji Ganesan had previously starred in a 1964 film with the same name. The fans had made a similar request in 2006, when Dhanush's film Thiruvilayadal was renamed as Thiruvilaiyaadal Aarambam (2006). However, unlike last time, the title of this film was kept the same.
In the police station scene there is a glimpse of a struggling butterfly which acts as a metaphorical representation, that was not planned. Theni Eshwar who is the cinematographer managed to capture it in-between the shoot and that shot made it to the final cut.
In promotional interviews, the cast members revealed that none of them did makeup for their characters. Actress Rajisha Vijayan was asked to get exposed to scorching sun, to get the natural tan needed for the character.