Martin Scorsese's latest epic 'Killers of the Flower Moon' is released in cinemas tomorrow, and needless to say, anticipation is sky-high.

Not only is a new Scorsese film always a treat, but this one stars both Robert De Niro and Leonardo DiCaprio - two regular collaborators of the director, but who have not starred in a film together since 1993's 'This Boy's Life'.

It seems that Di Caprio had a pretty big input into the process of 'Killers of the Flower Moon' too, according to comments made by Scorsese in a recent interview.

He revealed that the original script - an adaptation of David Grann's 2017 book which examined a series of murders amongst the oil-rich Osage Nation in the 1920s - was s straightforward procedural drama over 200 pages long, and it would take "four-and-a-half hours just to read it."

DiCaprio suggested that Scorsese re-work the script to make the relationship between Ernest Burkhart and his Osage wife Mollie the heart of the story - but that Paramount did not like this re-telling and dropped out out of the project. Apple TV later came on board as financial backers.

“Myself and [co-writer] Eric Roth talked about telling the story from the point of view of the bureau agents coming in to investigate," Scorsese told The Irish Tines. "After two years of working on the script, Leo came to me and asked, ‘Where is the heart of this story?’ I had had meetings and dinners with the Osage, and I thought, ‘Well, there’s the story.’ The real story, we felt, was not necessarily coming from the outside, with the bureau, but rather from the inside, from Oklahoma."

Scorsese also revealed that DiCaprio's penchant for improvising dialogue caused some issues with Robert De Niro, as the former's set discussions a d improv were "endless, endless, endless."

"Then Bob didn’t want to talk," he told the WSJ. "Every now and then, Bob and I would look at each other and roll our eyes a little bit. And we’d tell [Leo], ‘You don’t need that dialogue.'"

The film also stars Jesse Plemons as FBI agent Tom White - the role DiCaprio was originally earmarked to play in Scorsese's original draft.