"And that's now something that I'm obsessed with as well", father-to-be Harry revealed, with Prince William agreeing, "I know, I've got serious OCD on light switches now, which is awful".
Meanwhile, it's also been reported that Meghan and Kate Middleton, the Duchess of Cambridge, have butt heads over the treatment of staff.
But while there are several other heartfelt moments coming to light, more unfavorable news is emerging too.
So perhaps this helps explain the latest turn in the unfolding Meghan Markle-royal family drama: Apparently, Queen Elizabeth II and Markle have butted heads over royal protocol and, especially wedding preparations, a marked turn from the constant glowing updates about their seemingly doting relationship.
The former Suits star, now 37, eventually wore a diamond and platinum headpiece selected by the Queen. The mom-to-be wore a white cashmere sweater by VB in one of her engagement photos with Prince Harry.
Family members were also believed to be incensed by Meghan's treatment of the Royal Staff.
"And all of a sudden it becomes a habit", Harry continued, "and those small habit changes he's making, every single person can do and I think it's one of the key lessons that he taught us". She has very high standards and is used to working in a Hollywood environment.
Meghan's former agent, Gina Nelthorpe-Cowne, described her before the wedding as unique in her determination to succeed. "However there's a different degree of respect in the Royal household and Kate has always been very careful about how she acted around staff".
In royal biographer Robert Jobson's book Charles at 70: Thoughts, Hopes and Dreams, he claimed that before the wedding, Prince Harry, 34, raised his voice and yelled, "What Meghan wants, she gets!"
Despite the rules, the expecting mom is "determined to do things her way", said the source.