6 important things you probably missed on this week's 'Game of Thrones'

Warning: Spoilers ahead for Sunday's episode of "Game of Thrones,""No One."

"Game of Thrones" staged several reunions on this week's episode.

Brienne (Gwendoline Christie) arrived at Riverrun and met up with Jaime Lannister (Nikolaj Coster-Waldau), revealing some interesting layers to their relationship. Meanwhile, Meereen was under siege by the returning slave masters, but Daenerys Targaryen (Emilia Clarke) arrived in the nick of time.

Sandor Clegane (Rory McCann) caught up with the men who savaged the sept that took him in and settled the score. He also ran into an old nemesis. And Arya (Maisie Williams) came face-to-face once again with The Waif (Faye Marsay), who returned to finish the young Stark off.

With all that to pay attention to, there may have been some details that viewers didn't catch.

Here are six important things you probably missed on this week's "Game of Thrones":

SEE ALSO: The 6 most popular fan theories for how 'Game of Thrones' will end

DON'T MISS: The 5 most talked-about moments from last week's 'Game of Thrones'

"Cleganebowl" probably won't go down.

The show may have dashed fans' hopes of a popular theory happening. Referred to as "Cleganebowl," the theory basically says that "The Hound" will lock swords with his brother, Gregor Clegane, aka "The Mountain" (Hafþór Júlíus Björnsson), in a trial by combat revolving around Cersei Lannister (Lena Headey).

But on this week's episode, Tommen (Dean-Charles Chapman) decreed that trials would no longer be settled by combat. And with that, the chances of "Cleganebowl" happening are a lot slimmer.

The Lady Stoneheart theory.

Here again, another popular theory looked like it wouldn't happen. In this one, Catelyn Stark is brought back to life — sort of, she is more like a zombie — and commands a rebel army called the Brotherhood Without Banners in avenging the Stark murders. The theory looked doomed for a while when they destroyed the nonviolent group that took in Sandor Clegane.

But in this episode, we learn that those men weren't acting under the orders of the Brotherhood. That means that the group still has some honor and could very well still be part of Lady Stoneheart's plan to avenge the Starks.

The significance of Beric Dondarrion.

The last time viewers saw Beric Dondarrion (Richard Dormer) was during season three. If you'll remember, he was sent to hunt down Sandor Clegane by order of Ned Stark for crimes committed against the people of the Riverlands in season one. During season three, he had captured Arya and Gendry. Later, he sells Gendry to Melisandre (Carice van Houten), earning himself a place on Arya's kill list.

We now find that he's part of the Brotherhood Without Banners, which may be pivotal in bringing back Lady Catelyn Stark.