Tonight is the Academy Awards ceremony, and Kristen Stewart, who portrayed the late Princess Diana in the film "Spencer," is nominated for Best Actress, for her work at Buckingham Palace from 1982 to 1993, and at Kensington Palace from 1993 until Princess Diana's death in 1997.

McGrady recently spoke to "Insider" and revealed details that the film got wrong about the royal family. The film previewed at the beginning as "an allegory born of a true tragedy," which many took as fact. McGrady said that Spencer was creative in his storytelling and that audiences should not confuse fiction with reality.

"I don't want the audience to think the royals are bad people," he said. They weren't at all."

The film depicts Diana's arrival at Sandringham House, one of the Queen's residences, over the three days of Christmas 1991. McGrady told Insider that he was not consulted for the film, but that he could see snippets of interviews he had conducted over the years woven into the plot of the film. The first misconception relates to one of the opening scenes of the film, in which food for Christmas in Sandringham is brought in by military truck. This is incorrect; the food was locally sourced. McGrady previously told reporters that the military was used to transport the cooking equipment because Sandringham did not have its own kitchen budget, but the food was not only locally sourced, it was "simple food" that was ordered in reasonable quantities, not in excessive amounts as depicted in the film.

Spencer also describes Diana driving herself to Sandringham and getting lost, but this would not have happened since Christmas 1991 was her 11th Christmas and she would have known the area by then.

"The fact that she is lost is a metaphor for her life. 'She is lost in the moment. She doesn't really know where she is going."

Mac Grady praised Kristen Stewart's portrayal of the late Princess Diana, saying that no other actor has mastered Diana's voice and mannerisms like Stewart. She was "100 percent Oscar-worthy," he said.

But even so, the character of Diana in the film was not entirely faithful. Diana was not unhappy all the time, and the royal family was not "monsters," McGrady said. My big worry is that someone will see the film and say, 'Oh my God, that family was just sitting there and they were monsters.'

And finally, Spencer ends with Diana taking her young sons, Prince William and Prince Harry, to the KFC drive-through in a convertible. This is unlikely because there was no KFC in Kensington at the time, but McGrady said that Diana once took her sons to McDonald's and told McGrady to cancel lunch so the three of them could visit the Golden Arches.

"I said, 'Your Highness, why not, we can make better hamburgers than McDonald's.' ' She said. The boys want their Happy Meals and their toys.'