While Dominic West, who was joined by costar Jonathan Pryce in the interview, didn't elaborate further on his and Harry's falling out, he appeared to be referencing comments he made in 2014 about the group's rowdy celebrations after finishing their journey to the Arctic.

"Most of us, Harry included, just went on a two-day bender," Dominic revealed in a press conference at the time, per ABC News, "with the Icelandic truck drivers who had brought some lethal home brew with them."

The Affair star, who also cited Harry's ability to construct the group's temporary toilets, added that their post-trek partying included drinking champagne out of the prosthetic legs of fellow hiker Duncan Slater. 

But while Dominic wasn't able to get Harry's advice while gearing up to play his dad on The Crown ahead of assuming the role for season five, the duke did help shape the 54-year-old's performance on the sixth and final season of the series.

In fact, Harry's memoir Spare proved vital in helping prepare Dominic for the emotional moment Charles reveals to young Harry and his brother Prince William that their mom Princess Diana had died. "I bought it immediately," Dominic told Variety in an interview published Dec. 14, "and I think it did slightly affect the way we played that key scene where he wakes Harry up."

As for whether Harry will see how his recollections shaped his former pal's performance, he's admitted to tuning into the royal drama.

"It's fictional, but it's loosely based on the truth," he explained on The Late Late Show in 2021. "I am way more comfortable with The Crown than I am seeing the stories written about my family or my wife or myself. Because it's the difference between, that is obviously fiction, take it how you will, but this is being reported on as fact because you're supposedly news. I have a real issue with that."