https://archive.ph/ETISx
As the Duke tells viewers there is a “hierarchy of the family,” an image of the Buckingham Palace balcony, taken during Trooping the Colour in June 2019, is shown.
However, the angle it has been taken at suggests that the now Princess of Wales, wearing eye-catching yellow, is centre stage, positioned in the middle and therefore at the very heart of the monarchy.
In fact, Queen Elizabeth II, as ever, was standing firmly in the middle of the balcony for the RAF flypast.
The Duke and Duchess of Sussex appear on the far right of the image, as if on the periphery of family life. But they are actually standing closer to the late Queen, and therefore closer to the centre, than the Cambridges, as they were then.
Just a quick, unrelated comment on the "hierarchy" issue in the docu-series.
For someone who lives in the UK or any other European kingdom for that matter, it is quite obvious that royal families have a natural hierarchy. However, this series is primarily aimed instead at the casual American viewer, who may have no understanding whatsoever of hereditary monarchy or how the line of succession works.
As absurd as it may sound, it is not at all inconceivable that a casual American viewer may ask himself or herself why Meghan couldn't "be queen instead of Kate" if she was "more popular" than the latter (not factually true actually, but what the trailer is clearly hinting at with the "Meghan was becoming a rock star" line). Furthermore, from an American point of view (again, ignoring how monarchies work), a common conclusion is that, if X has more merit than Y (e,g., is "more popular"), but Y is hierarchically superior to X, that must be because X is a victim of some kind of structural bias (for example, racism).
Again, as I said, that is a completely unreasonable and fallacious argument in the context of a hereditary monarchy, but my point is that it is an argument that can be peddled to some audiences in America.
A different (and separate) issue is the argument that Harry is apparently going to make that "his family was not safe" in the UK and, therefore, they had no other choice but to leave. That is probably the most hurtful argument from the British point of view, because it would be an indictment of the British public/society at large and the British government/institutions, and not only of the Royal Family or the Palace. I am not sure, however, if that line of reasoning will fly, even in the US, because, as others have already said, it conflicts with the fact that the Sussexes did not originally intend to leave the UK, but rather live there part-time and keep doing public engagements in Britain. If the UK is as toxic, racist, and unsafe as they now claim, I don't see how they could still be in the UK for four, five or six months per year without that being a major (psychological or even physical) risk to the family.