According to country artist Rodney Crowell, Hiddleston spent last September at Crowell's home in Tennessee to study the life of the late singer. In a lengthy Facebook post, Crowell spoke of Hiddleston's hard work ethic in studying the life of mannerisms of Williams.

"After nearly a month spent collaborating with this gifted artist, I'm as respectful of the man's work ethic as I'm mystified by his transformational skills," Crowell wrote. "Without a doubt, the filmmakers chose the right actor for the job."

Previously, Hank III has been outspoken about the film and has shown his distaste for the lead actor on multiple occasions in the role of his grandfather.