@MissEliza
There was so obviously going to be a culture clash. Why then when there were problems, did those involve not recognise this was down to differences in culture rather than taking them personally? It's immature and unprofessional. There are actually books written for those in multinational businesses to help them reconcile cultural differences. It's not something unique to MM as an American trying to deal with British people.
I agree they should have considered this. But I wouldn't have expected Harry to really appreciate it to be honest (and he is used to having a team of people considering his personal needs, without appreciating the effort that goes into that). And I suppose I can say this as a American-born myself: with certain types of things, Americans really struggle to appreciate that other people do things differently and that THAT IS OKAY. I experience this sort of, answer my email today now, drop what you're doing and do this for me, now everyday at work. I can deal with it (and it's more that I have to remind myself not to behave like that myself) but it takes time to create boundaries. I often receive emails from US based colleagues who assume I will be sympathetic along the lines of: Where is so and so? They're taking ages to get back to me. (It'll have been two hours.)
Here's another example. When I was in grad school and living in London a friend of mine from college came to visit from Switzerland where she was working for the subsidiary of a US private bank. I was living in a bedsit in a nice part of town but it was a bedsit. She was living in a company sponsored flat. We had a fraught weekend around why I wasn't 'calling cabs' to get to the theatre (because you could hail one right outside) and lots of other things along the lines of general frustration with London. And this is a person who had also lived in this country for a year abroad in a prestigious London university - spent with all other Americans largely, but she had been here. My money was tight.
She left a very expensive costume jewellery necklace and a hair dryer behind, both of which she expected me to post back to her. The hair dryer I explained would have to wait (this was the early 90s and I am not even sure what it would have cost me to post) but I said I would post the necklace. She called before the week was out asking where the necklace was. I was like: Okay, yes I will post it and that's when I learned what her timeline was. Right then. Immediately. Now. Maybe I was supposed to Fed Ex it? God knows. We (sort of) discussed that our timescales were different and she told me she'd moaned about me to her boyfriend in New York. He said to her: "X, not everyone works for [high powered investment bank etc.]"
I do think it is highly likely that with regard to running their 'court' it would have been visible that Meghan came from the sort of envrionment I described above. It would have been a shock and also, as a previous poster pointed out, that there will be those in the palace who relished putting her in her place.