The cock fight in the film is mostly symbolic and fictitious, as the story came mainly from the account of Siamese POWs after the first sacking of the Ayutthayan Kingdom. The cock fight symbolizes the resilience and bravery of those who fought for Siamese independence.
Phra Suphan Galaya, presented as Naresuan's older sister, presented to Overlord Bayinnaung as tribute, is a late addition to the Naresuan legend; as there is no substantial evidence of her character in the historical annals.
The movie took seven years to realize, prepare, and produce. Originally planned to be one continuous film, the director decided to make a trilogy because a single film could span too many hours.