Peacemaker listing off a bunch of famous people that Ecomonos could have sent to jail instead of his father was entirely improvised by John Cena. He was originally supposed to list just two people but James Gunn let him continue for as long as he could.
When Peacemaker learns that Economos sorta accidentally framed Peacemaker's dad, Peacemaker lists off multiple famous people he could have used instead. In the extended 2 minute version, Peacemaker lists Freddie Stroma and James Gunn, and Economos retorts that those two aren't even real. Freddie Stroma plays Vigilante (who happens to be in the same room in that scene) and James Gunn is of course the show's director.
A newspaper clipping in Peacemaker's trailer mentions he defeated Kite-Man, an infamous Batman villain. Kite-Man is a criminal who has the ability to fly thanks to a glider suit he wears. Kite-Man's origin came after Riddler poisoned the rope on Charles Brown's son's kite, resulting in Brown seeking revenge and fashioning a kite suit to remember his son.
The episode opens with Peacemaker making a Prairie Oyster, an infamous real-life hangover remedy.
Peacemaker name-drops 80 celebrities.