Spoilers seas... well for everything If the Tyrells had known about how dangerous Joffrey was before they formed an alliance with the Lannisters/Baratheons could they have successfully forced a different arrangement?, Joffrey wasn't just difficult or…
When Stannis is done throwing the last leech into the fire and says "The usurper, Joffrey Baratheon", it cuts to Joffrey drinking wine at Tyrion and Sansa's wedding.... This could just be a pure coincidence but I thought it was pretty cool.