The conversation in Obi-Wan’s hut probably has the most densely packed collection of these throwaway lines with canon backstories:
“[Anakin] was a navigator on a spice freighter” - The Twilight from The Clone Wars movie and a couple of episodes from the show.
“You fought in the Clone Wars?” - AotC, The Clone Wars movie and series, RotS
“For over a thousand generations the Jedi Knights were the guardians of peace and justice in the Old Republic. Before the dark times, before the Empire.” - pretty much everything before Order 66
Other throwaway lines with later explored backstories include:
“We’ll be sent to the spice mine of Kessel or smashed into who knows what!” - introduces both spice and the mines on Kessel
“We go way back, Lando and me.” - explored in Solo
Two throwaway lines that I’d like to see backstories for are:
“The bounty hunter we ran into in Ord Mantell changed my mind.”
“Many Bothans died to bring us this information” - Personally, I want this story to involve Mon Mothma having to go undercover and undergo the same type of transformative surgery that Obi-Wan underwent in the Clone Wars episode “Deception”. This would retcon how her appearance transforms from Genevieve O’Reilly in the prequels, to Caroline Blakiston in RotJ, and then back to Genevieve O’Reilly in the Ahsoka series without devaluing either actress’s performances.
[Edit: The specifics of how Obi-Wan got the nickname “Ben” would also be cool to see. We know it has to do with Satine somehow, but how did that nickname come about and why did he use it briefly in The Clone Wars series and after Order 66?]
[Edit: “I see you have constructed a new lightsaber” - How Luke got his green lightsaber is shown in a comic, but it still would be cool to see in live action or animation.]
The backstory of how Leia got the bounty hunter disguise from RotJ would also be nice to see beyond its presentation in the Forces of Destiny series.
That’s one thing they are not consistent about at all in the SW universe, the rules of hyperspace.
In the final sequel film, a ship entering hyperspace is a deadly relativistic weapon that slices a star cruiser in half. In Rogue One, as the ad-hoc rebel fleet begins to flee at the approach of overwhelming force, fleeing ships bounce uselessly off like gnats.
Battlestar Galactica did ‘hyperspace’ best in my opinion. The atmospheric belly-flop maneuver was dramatic because they had well-established reasons why it was a risky and daring move.
I think the consistency can be resolved by proposing that how damaging a jump into hyperspace is depends on at what point it is intercepted. Holdo was an expert in combat and so knew the distance needed to get the greatest impact. And maybe didn’t even realize how big it would be, after all it was a desperate move to try and buy time and not a used tactic because of the cost vs. payoff. When the Executor drops in right in the middle of things there isn’t enough distance to get to a full “detonation” effect, plus do we fully see if there is no damage at all?
Basically just like some explosives, you can have a full effect or a fizzle that does minor damage, depending how how it is set off. Holdo was (probably) planning or hoping for maximum effect, while the rebels at Scarif were just trying to get away and had no clue there’d be something in the way.