The Song Rhaenyra Loves Is Another Nymeria Reference 

King Viserys Recalls Targaryen Dreamer

Viserys talks about his own aspiration to see his son sit on the Iron Throne and remarks on how few Targaryens have aspirations. This is true, yet those that are helped shape House Targaryen’s history.

House Of The Dragon References Tyrion’s Trial Episode

Otto Hightower makes reference to "the laws of Gods and men" during what now seems like his once-per-episode pontification on what is right and proper in the world. It's an intriguing House of the Dragon Easter egg because the phrase was used as the episode title of Tyrion Lannister's trial in Game of Thrones season 4, episode 6.

Does The Crabfeeder Have Greyscale?

The conclusion of House of the Dragon season 1, episode 2 had primarily hinted that the Crabfeeder would be the series' first significant antagonist, with the possibility that Daemon's War for the Stepstones might extend for at least a few episodes.

The War for the Stepstones Has A Lot Of Battle Of The Bastards Parallel

This is House of the Dragon’s first big battle episode, and it sticks closely to Game of Thrones’ template in a lot of ways, in particular the Battle of the Bastards (which was directed by House of the Dragon season 1 co-showrunner Miguel Sapochnik).  

The connections are more obvious when compared to "Battle of the Bastards," which also began with a dragon battle in Meereen. Jon going directly for Ramsay is like Daemon going straight for Crabfeeder; Daemon dodging (most) arrows while running is reminiscent of Jon. Died Rickon Stark

Jon's army is encircled by the enemy, as is Daemon, and Laenor Velaryon's last-minute appearance on the back of the dragon Seasmoke to help win the day is reminiscent of the Knights of the Vale.