Outside of Tertiary Access Eleven, we see the grid equivalent of automobiles, a bus, and some parked bicycles.

Inside the apartment building lobby where Exo drops off a package, there is a roughly person-sized cubular tower and when Exo walks past it, a callout bubble onscreen says "Talk to Aysta". There is no description in the game materials of who or what "Aysta" is. In the playthrough video of the game I watched, the player does not stop at it.

Conn, a Core guard who interrogates Exo and later pursues her for her "crimes", remarks to her, "...I'm thinking you might be my ticket out of this code dump." In computer terminology, a code dump (also known as a "core dump", "crash dump", or "memory dump") is a snapshot of a computer's or a program's memory and system state at the moment it crashed or stopped working.

Conn remembers that a couple hundred cycles ago, a program predicted an apocalypse just like what is going on now. That program was Cass, as seen in Arq Grid.

In the Arena building, Exo speaks to Baud and gets information about the "inquisitive" program. "Baud" is a unit of measurement that determines the speed of communication over a data channel in electronics.

To escape the Arena, Exo fights a guard named Qwert. Q-W-E-R-T are the first five letters on the top letter row of a typical QWERTY Latin-script keyboard.

Exo finds Query at Prime's bar and when he guesses she is in trouble, she remarks he should be a detective and join the Disciples of Tron. He is a former member of said disciples, now retired, as seen in Arq Grid.

Query remarks that he made a lot of mistakes his last night on the job as a Disciple of Tron. It's unclear whether he is referring to the case he investigated in Arq Grid or some other, later, investigation.

Weaver is consistently referred to as "they" instead of "he" or "her", implying this program is transgender.

Inside the version of Flynn's Arcade inside the Arq Grid, Exo remarks to Gro that she used to fix all machines at school, all the classics like Mondo Push, Interception Zone, and Black Neon. This is the first mention of all these games.

The characters in the game (such as Dos and Vac) refer to their significant others as their "parallel". This is probably a nod to "parallel computing." 

During Exo's attempt to escape from induction into Tacitus' ranks after being captured by Conn, she goes through a "Primary Process" (sort of the game equivalent of a "level", I guess) called "Bodhi's Legacy". Bodhi was a program who appeared in "Beck's Beginning", a brash and impetuous vehicle maintenance worker at Able's Garage who was friends with co-workers Beck, Zed, and Mara. He was derezzed in that episode by one of Clu 2's guards.

In reaching the Outlands beyond the boundaries of the Arq Grid, Exo flies her stolen Light Jet through the Yori Valley. The valley is presumably named after Yori, a program in the original ENCOM Mainframe created by programmer Lora Baines as seen in Tron.

When Exo asks Oracle if she is aligned with Core, Oracle responds, "No. I find myself more aligned with Automata. The Users, if they ever existed at all, have turned their backs on us. Core are waiting for a server that will never ping." The "server that will never ping" remark is a reference to the act of performing a "ping" (Packet Internet Groper), a basic internet command used in computer network administration to test and verify the availability of a destination IP address assigned to a device.

Switch tells Exo to be careful, "Enough voxels have been spilled today." A voxel is a value representation on a three-dimensional grid, the way a pixel is on a two-dimensional grid.

Switch tells Exo "userspeed". This would be the digital world's equivalent to saying "Godspeed" in our world.

Query's female investigator friend leaves a message in the form of a data fragment, telling him she left another data fragment about Cass under the table she and Query used to play Go at. Go is a board game that originated in ancient China over 2000 years ago and is still popular today. Flynn had a Go board with the pieces arranged in the middle of a game at his sanctuary in the grid in Legacy.

Query gives Exo a code that provides Decoy ability, saying it was given to him by a man he met in a library long ago. This is a reference to events in Arq Grid and the Automata ambassador Sierra.

Conn refers to his lifetime as "runtime". This may be the Grid's term for "life".

Memorable Dialog

don't get yourself involved in other programs functions.mp3

that explosion really refactored your code.mp3

an apocalypse just like what we're in right now.mp3

you have no idea.mp3

I just don't like repeating mistakes.mp3

most programs he meets are impressive compared to him.mp3

Core are waiting for a server that will never ping.mp3

end of line, program.mp3

it does not sate the beasts' hunger, it increases their appetite.mp3

does the story of Flynn and Tron themselves not teach us this?.mp3