It’s a look at the decadence and dark side of royalty, with the first confrontation with the colonialism and imperial tendencies that the crown still represented at this point; Elizabeth casually refers to the people of Nairobi as savages, while Philip demonstrates some of the tactless behaviour he’s become known for in recent years.
It’s interesting to see the show tackle these themes, albeit not in much depth – it’s difficult to read exactly whether the show is romanticising or rejecting this behaviour. Perhaps more accurately, it’s simply saying that it happened – and there’s a certain power in that, to just represent the flaws of our characters, and not shying away from the things that can make them dislikeable.
This is another positive review of The Crown, because I thought it handled the themes of colonialism and imperialism reasonably well. By the end of the series, I was far less convinced of this. I suspect that Hyde Park Corner would have been a good starting point, had they built on it further, but – well, I’m getting ahead of myself somewhat now.