Vijay was De-aged in the film for his son's role.
Vijay's father and son roles' voices are different in the Hindi version. Sanket Mhatre dubbed the father role while Vaibhav Raj Gupta dubbed the son role.
Gandhi's (Vijay) son, Jeevan (also Vijay) goes by the name Sanjay, which is also the name of Vijay's real-life son, Jason Sanjay.
They created an Al based duplicate of Late actor Vijayakanth in Vijay's introduction scene.
The Greatest of all Time marks director Venkat Prabhu's first film to have a Pan India release in the hindi language theatrically apart from telugu. Previous Venkat Prabhu films have had separate telugu dub versions such as Chennai 28, Saroja, Mankatha and Masss with Custody being Prabhu's debut Telugu film.