Liz's apartment is the same one as Mr. Kotter's Brooklyn studio apartment from "Welcome Back Kotter."
Jeannie Linero appears for the first time as Liz Garcia, Chico's girlfriend.
Bill McLean had previously appeared in #1.19;"The Doctor Story" and #2.4;"Play Gypsy." Each time, as a different character.
Ed is really just trying to be self deprecating in his honest apology to Liz. He knows a lot about singing and is very talented. That was clearly seen in #2.5; "The Disappearance."
Chico will date two other RNs in later episodes. Patty Villa, in #3.3;"Chico Packs His Bags" and Lisa Malone, in #3.4;"Chico's Problem."