The addition of King Jaehaerys Targaryen II

According to Sapochnik, Martin had taken note when "Game of Thrones" showrunners David Benioff and D.B. "Dan" Weiss left Jaehaerys II out of the listed line of rulers when it came to historical Targaryen kings in the fictional universe.

"David and Dan and skipped over Jaehaerys for reasons of clarity that he really didn't understand," Sapochnik said, referring to Martin. "He had a bee in his bonnet about it. He wanted us to right that wrong."

As for the other requests that revolved around color, Martin was hopeful that "House of the Dragon" would be the perfect time for fans to see dragons of varying size, shape, and color.

Colorful dragons

In "House of the Dragon," each creature should be distinct enough for people on the ground to know which Targaryen is flying above them based simply on the color of the dragon's scales.

Bright Heraldry

Martin also asked that "House of the Dragon" include a lot of symbolic color related to all the major and minor Houses of Westeros. He spoke with Condal about the heraldry fans would see and that detail's importance in the story.