Goof: Eriq La Salle is incorrectly listed in the opening credits as "Eriq Lasalle."
Carter and Gates playing basketball is reminiscent of of the same kind of scenes between Doug Ross and Mark Greene in the early seasons.
In this episode we hear, for the final time, the recurring ER phrase "Isn't that a nurse's job?". It's been said by almost every round of fresh med students.
In this episode we find out that Susan is no longer with Chuck, and that she is dating again.
The way Carter teaches Rachel how to do an IV is the exact same way Dr. Benton taught him in the pilot episode, "24 Hours."
An early scene in this episode mirrored the way the pilot episode, "24 Hours," opened, with Nurse Lydia Wright waking up a doctor in Exam Room 8; Dr. Greene in the pilot and Dr. Morris in this episode.
The music number played at the end when Neela is leaving and joining Ray, is the same music number that plays for Dr. Greene in Orion in the Sky when he is leaving, and for Abby. When she is dancing with Frank and leaving as well.
Goof: When Haleh takes Abby to the wall of name plaques in "The Book of Abby," the wall is behind a door. In this episode, however, the wall is not behind any doors.
Goof: When Carter is being prepped for surgery, his belly is briefly shown being covered with betadine, and there is no laparotomy scar to be seen. In the Season 6 episode "All in the Family," Carter got a full midline incision when he was operated on after being stabbed.
Goof: When Carter is being taken to Northwestern by ambulance, his clothes and shoes are put over him, and his shoes keep on flipping sides between views of him.
Goof: This episode deviates from ER history with respect to Carter's kidney issue. When he was stabbed and operated on (in season six's "All in the Family"), Anspaugh and Benton managed to save his kidney, despite Benton near-panicking and wanting to take the kidney out; the kidney was mentioned as pinking up. So Carter should have one good kidney.
Goof: Banfield refers to Carter's forearm dialysis access as "a shunt." The term is not commonly used anymore when it comes to dialysis access, or it is used only to refer to a temporary access. Carter needs a kidney transplant, meaning he is in end-stage renal failure (also known as Chronic Kidney Disease Stage 5 - CKD5) and he most probably has a permanent dialysis access on his arm, either an arterio-venous fistula or a graft. Given the position of it on his arm and the general aspect of it, it looks like he has a graft.
There's an irony of Carter returning on Valentine's Day, given what we find out is his primary reason (a kidney transplant) - it was the same day nine years prior that Carter was stabbed that led to this moment (in the sixth season episodes "Be Still My Heart" and "All in the Family" where Lucy Knight also died).
Carter: Looks like you followed my advice, Archie.
Morris: How's that?
Carter: You set the tone.
This is a reference to a conversation the two had in the Season 11 episode "The Show Must Go On."
Music: "Southside of Heaven," Ryan Bingham
Goof: The street musician behind Simon Brenner in the second section, singing "Mad World" as Brenner watches Neela leave, is actually Scott Grimes, who plays Archie Morris.
Music: "Mad World," Tears For Fears (Neela's ringtone)
In each version of Neela's day she drops her mobile phone and Dr. Brenner picks it up.
Title: "Dream Runner"
Gates and Morris treat a patient who is a "dream runner," defined as someone who is sometimes unable to go into a paralytic state during sleep, causing them to physically act out their dreams.
Goof: In the first scene, Neela's phone indicates 6:23 a.m., but in the same shot the clock indicates 5:04 a.m.