Wilhelm Scream: Uttered by Rodian passerby during Speeder chase.
When Rowan tells the others to take a left turn towards the market, the Aurebesh lettering above the tunnel arch reads "Passage to Bazaar".
R0-GR gets in trouble with a group of Ranats in the Wheel's ventilation shafts. This large rodent-like species was first seen, very briefly, in the Mos Eisley Cantina in Star Wars: Episode IV - A New Hope (1977) after Greedo gets shot.
The Aurebesh text on the business-card Yeppau holds up translates to "The Freemaker Workshop, Salvage, Repair".
The Aurebesh text visible next to a door on the lower ring of the Wheel reads, from top to bottom: "Open" and a sign located near the elevators translates to "The Broken Spoke".