The planet Balmorra first appeared in the Legends comic Star Wars: Dark Empire II. Though it was name dropped in episodes of Star Wars: The Clone Wars, this is the planet's first onscreen appearance.
The Imperial Gozanti cruiser first appeared in Star Wars Rebels.
The design of the Remora is based on the Meson Martinet, a ship glimpsed in Star Wars: The Force Awakens, expanded upon in the LEGO Star Wars: The Force Awakens video game, and then fully realized in Star Wars Resistance.
Rex's efforts against the Empire and his building of a network of clones has been a constant throughout the series, and here we start to see the culmination of the forces he's been marshalling — now with Echo's help. Among the familiar faces are Howzer from the Season 1 episode "Rescue on Ryloth" and Gregor, last seen in the Season 1 episode "War-Mantle."
The IT-O Interrogator that Hemlock uses on Crosshair is a similar model to that used on Princess Leia in Star Wars: A New Hope.
