Emma Stone told Prince William and Kate Middleton she rode a motorcycle around Buckingham Palace

• Emma Stone spoke with Prince William and Kate Middleton over a video call on Monday.
• Stone opened up about shooting her new film, "Cruella," around Buckingham Palace in London.
• Emma Thompson revealed that she rode London's public transportation in costume during a protest.

Emma Stone shared a laugh with Prince William and Kate Middleton about her visit near Buckingham Palace.

The Oscar-winning actress sat alongside Emma Thompson and the Duke and Duchess of Cambridge on Monday for a video call to chat about the new Disney film, "Cruella." The conversation was scheduled two days before a drive-in screening of the movie for NHS medical staffers and frontline workers in Edinburgh, Scotland.

During the video, Stone recalled the cast's experience shooting the film in London.

"We were in front of Buckingham Palace at one point. I was riding a motorcycle around the mall," Stone, 32, said.

William suddenly chimed in with a joke, saying: "We should have had you stopped, Emma. It's very dangerous."

Stone replied to William: "I know, I really got away with it!"

Buckingham Palace is under tight security, and members of the Queen's Guard, the infantry that protects Buckingham Palace and St. James Palace, are stationed at the premises.

Thompson, who played the Baroness in "Cruella," also shared behind-the-scenes details from the film.

She recalled one day when the cast was supposed to film in Covent Garden, but a protest made it difficult to reach the set.

"Our car couldn't get to where we were shooting," Thompson, 62, said. "I said, 'We've got to get out. We've got to go by tube."

Thompson boarded London's Underground wearing a tall wig and "huge eyelashes" that made her look "like a llama."

"I swear to God, I thought, 'It's going to be fine. It's only Sunday morning, 9 o'clock Sunday morning, there won't be anyone,'" Thompson said. "It was rammed."

She added: "Thankfully, no one took the slightest bit of notice. They all clearly thought I was a drag act on the way home."

"Cruella" was released in theaters and on Disney Plus on May 28 via Premier Access.