Next: enter the Tyrells. The vines of the Tyrell rose wrap around the paw of the Lannister lion, and Olenna reminds us of who killed King Joffrey: “You don’t think I’d let you marry that beast, do you?”
But we know that Cersei eventually got her revenge. We see an image of the Tyrell rose. It’s still at first, and then it ignites into flame, a clear reference to Cersei killing Margaery and Loras by blowing up the Sept of Baelor. We hard Qyburn’s line from “The Winds of Winter”: I now proclaim Cersei of the House Lannister, Protector of the Seven Kingdoms.”
Joffrey’s death hasn’t come up in a while, but now that Cersei is queen and at war with the Tyrells, the chances that she’ll find out Olenna was actually behind it tend to increase.