The depressing tone of this episode is set by the song "Is That All There Is", hinting to existentialist issues by the truckload.
The awful Seventies' clothes mark the end of the stylish Mad Men era, even before the closing of the series. Roger himself, an usually dapper character, is first seen in a seedy bar, sharing a drink with his pal Don and three girls, sporting huge, white moustache and wearing a pastel-colored tuxedo (if I am not mistaken).
Enters waitress Diana, my least favourite of all Don's dalliances. Diana is a depressive, plain, ominous woman who reminds Don of Rachel. Don tries to hit on her, but he's forced to leave with Roger and their female friends.
Now living alone in his huge, empty apartment, ageing playboy Draper starts to feel the emptiness of his life. He tries to reconnect with Rachel only to learn she just died. He goes to the memorial, only to find her rude sister giving him the cold shoulder.
Considering how long ago the Don-Rachel fling was, I found Rachel's sister behaviour disproportionately unfriendly. Women have plenty of unsuitable boyfriends before settling down, but I bet it's rare for any to go to a memorial years after the split.
Meanwhile Joan and Peggy get dissed by macho men executives at McCann but this doesn't elicit sisterly feelings. Peggy gets angry about Joan complaints, telling her that if she doesn't like it, she doesn't have to work, since she's filthy rich. Promptly, Joan leaves the office and goes on a shopping spree.
Peggy tries blind dating and it's half of a success, the only lighthearted moment in a sea of gloom.
The episode ends with Don stalking creepy Diana, who's none too pleased about his attentions. A disappointing start of the last part in the Mad Men journey.