The Sankara Stones from Indiana Jones and the Temple of Doom (1984) can be seen in Luthen's store. This is a callback to the Indiana Jones movies which themselves always had Star Wars references hidden throughout them.
The proverb "the axe forgets but the tree remembers" is Zimbabwean from the Shona tribe. It means that a person who harms another or borrows from someone will often forget, but the person who is harmed or borrowed from will always remember.
Fondor is briefly mentioned in this episode. Fondor is home to the Imperial shipyards that produce the Empire's Star Destroyers and plays a large role in Legends material.
In the back of Luthen's shop two objects on an upper shelf very closely resemble Jedi and Sith holocrons like the ones seen in Star Wars: The Old Republic (2011), Star Wars: The Clone Wars (2008) and Star Wars: Rebels (2014).
The first time that a wristwatch is seen in the Star Wars universe; when Lieutenant Gorn checks the time as the rebels signal from the hillside.