- The Inquisitors play a primary role in the series, originally introduced in West End Games material before being modernized in Rebels. On top of the Grand Inquisitor and Fifth Brother being characters from Rebels themselves, the two new Inquisitors (Third and Fourth Sisters) show some nice cross-media synchronicity by being the only two numbers left that hadn’t already been defined by a show, book, comic, or game in the last few years.
- Obi-Wan works at Tibidon Station, harvesting meat from a long-dead space creature. The tibidon is a relation of the tibidee, a flying creature from Rebels.
- Breha’s sister and her family visit Alderaan, with the sister identified in the credits as Celly Organa. Though she was technically Bail’s sister in Legends, the character originated in the novel Children of the Jedi as one of Leia’s aunts. The change from being Bail’s sister to Breha’s sister is another signal that Breha is the Organa of the family by birth and Bail took her last name, something publishing has been leaning towards in recent years.
- Leia spies a Tri-wing leaving Alderaan, a ship design created in partnership with Porsche several years ago finally making its onscreen debut. She identifies the ship as belonging to an Aquillian Ranger, a group that comes from George Lucas’ original drafts for the franchise, and she speculates they could be scouting for Merson pirates. The Merson pirates were introduced in the classic Marvel comics as a group that came into conflict with Obi-Wan in the first story to show his younger days.
- Breha bemoans that raising Leia is like raising a Glor-ag while Leia later proclaims she would rather be digested by a jakobeast than apologize. Both are obscure creatures originating in RPG materials, the former from West End Games and the latter Wizards of the Coast.
- Bail expresses that he wanted to chase purrgil like the ones seen in Rebels when he was younger, reminiscent of ancient whaling in real life. Similar comparisons were made in Resistance and its BTS materials.
- Bail and Leia discuss her future days in the Junior Senate. Whether intended as a direct reference or not, Leia’s later time in the Apprentice Legislature was depicted in Leia, Princess of Alderaan.
- One of Leia’s kidnappers is a Falleen, marking the live action debut of the species introduced decades ago in Shadows of the Empire.
- The girl on Daiyu offers Obi-Wan a variety of spice including glitterstim, a type of spice introduced in the Jedi Academy Trilogy. It’s a bit ironic that it’s listed after Kessel pure in the show since it was originally introduced as the variety mined on Kessel.
- Haja smuggles a Force-sensitive boy and his mother off Diayu bound for Corellia. In the credits, the boy is identified as Corran. Though she isn’t identified in the credits or any primary sources, his mother has been identified as Nyche by other sources including the actress herself. Nyche was the mother of Legends Jedi Master Corran Horn, who was the Corellian son of a Jedi purge survivor.
- Haja sends Obi-Wan and Leia to meet up with Tala on Mapuzo, a planet passingly alluded to in Adventure Journal. Its placement in the Mid Rim, mentioned in the third episode, was established by The Essential Atlas.
- Obi-Wan has vague recollections of having a baby brother before being taken into the Jedi. Though it wasn’t present in the final film, the screenplay for Return of the Jedi introduced the idea that Owen Lars had been Obi-Wan’s brother, which the early Expanded Universe ran with until it was debunked in the prequels. Jedi Apprentice: The Hidden Past also included Obi-Wan having vague memories of his brother.
- The Empire is stripping Mapuzo of vintrium, an ore that was first introduced in Goroth: Slave of the Empire as being part of what made the titular planet strategically valuable to the Empire.
- Tala mentions the Empire’s hunt for Force sensitive children and the ambiguity of what becomes of the children after, a story thread that has remained open since Rebels introduced it.
- Obi-Wan is surprised to learn that his old friend Quinlan has survived the Purge to become a part of the Path. Quinlan’s fate has been unresolved since his death was cut from Revenge of the Sith, with the Republic comics showing his survival of Order 66 in Legends and the Darth Vader comic more recently implying the same thing.
- The Aurebesh writing in the background on the walls of the Jedi room is littered with references, most of them impressively obscure.
- “Djinn Altis” and “Roganda Ismaren” are scrawled on the wall, the two of them both Jedi survivors introduced in Children of the Jedi.
- “Valin Halcyon” is another name that can be made out. Though he became known as Hal Horn later in his life, Valin first mentioned in the X-Wing novels as the father of Corran Horn and the son of Jedi Neeja Halcyon. His name’s presence lends further credence to the aforementioned child being Corran Horn.
- Not all of the writing on the wall is in Aurebesh. Some Protobesh can be seen to spell out “Ekria,” the name of another Jedi survivor from the Evasive Action webcomics.
- One bit of Aurebesh writing spells out “for life and light,” marking the first reference to The High Republic in live action, though the phrase is usually given as “for light and life.”
- The Path leads to the muddy planet of Jabiim, which was introduced in the Republic comics. It was an important world to Obi-Wan in those stories as it was due to a brutal battle there that he was presumed dead for a time.
- Fortress Inquisitorius on the moon Nur serves as a primary setting for the series, a setting taken directly from Jedi: Fallen Order. Slightly revamped purge troopers, also from the game, follow behind Third Sister. The facility is prowled by ID droids, first seen in Rebels. Inside the depths of the fortress, among the preserved corpses of Jedi, is Tera Sinube from The Clone Wars.
- Tala namedrops Florrum in the Sertar sector, from The Clone Wars. The Sertar sector was first mentioned in a non-Star Wars reference book featuring ideas from George Lucas before The Essential Atlas placed Florrum there. Reva mentions Balnab as well, also from The Clone Wars.
- The wall at the Path’s base on Jabiim has several more Aurebesh Jedi names carved into it.
- Most clearly visible is Corwin Shelvay, a Jedi prominently featured in Galaxy Guide 9.
- Drake Lo’gaan can also be seen, the main character of the same webcomics that Ekria originated in. Ekria’s name can be seen in Aurebesh here as well rather than Protobesh.
- The name Tiberus is present, likely in reference to a minor Jedi survivor from the Galaxies MMORPG.
- Several initials are also present on the wall. I have some guesses (like MF for Minos Fel’kona or RK for Rahm Kota) but these are less concrete than the ones obviously spelled out.
- Tala recalls an incident on Garel, a planet seen prominently in Rebels.
- Coincidentally or not, Qui-Gon’s new ability to manifest as a ghost physically was introduced as something he learned over time in Claudia Gray’s From a Certain Point of View story. Skywalker: A Family at War previously foreshadowed Obi-Wan making first contact with his old master ten years after Revenge of the Sith, the timeframe of this show.