I for one thought there was too much Thatcher this season. This show is called The Crown, not The Parliament. I realize the two are intertwined, but there were too many Thatcher-centric episodes where the royal family played supporting characters. It's not that I wanted the season to be all about Charles and Diana - far from it. I would have liked to see more episodes devoted to the Queen herself, and perhaps her other children. What we got of Andrew and Edward were little more than cameos.
I also thought Gillian Anderson's portrayal of Thatcher bordered on parody. It may not be a fair comparison, but I much preferred Meryl Streep's interpretation of Thatcher, essentially capturing her essence without doing a full-blown, campy impression of her.
I enjoyed Josh O'Connor as Charles in Season 3, but he looked far too young in Season 4. He still looks like he's in his 20s and he should have been closer to 40 by the time this season ended.
Both Charles and Diana came off very poorly, as compared to the canonization most stories give Diana. I still think Charles is far worse, however. What 19 year old girl wouldn't have been swept off her feet at the idea of marrying the Prince of Wales and becoming the future Queen of England? It's literally a fairy tale come true. She at least seemed to want to make a go of it. He never did. Perhaps for one split second, during their Australian trip, if this show is to be believed, but that quickly dissolved once he began to see she was stealing his thunder.
I got used to Olivia Coleman and Tobias Menzies but they had comparatively little to do than Claire Foy and Matt Smith. I guess Elizabeth and Phillips' lives just weren't very interesting post 1980?