The Bruce Wayne of Earth-99 describes Superman as a strange visitor from another planet with powers far beyond those of mortal men.
On Earth-167, Lois wrote articles for the Daily Planet entitled "Caped Wonder Stuns City" and "I Spent the Night with Superman."
Kara refers to Lex as a "poisonous snake."
The Superman of Earth-96 says that this is the second time that he went crazy and fought himself.
On Earth-96, Lacy Warfield was among the Daily Planet staff members killed in the Joker's poison gas attack.
When Harbinger recruits Heat Wave, he comments "You had me at 'beer'," which mirrors the famous "You had me at 'hello'" line
Clark Kent and Lois Lane from "Smallville" make appearances.
Brandon Routh reprises his role as Superman. The Superman of Earth-96 says that his Earth-38 counterpart's son Jon looks just like his own son Jason.
The Green Arrow appears in part two of a five-part episode that continues on Arrow: Crisis on Infinite Earths: Part Four (2020).
The Flash appears in part two of a five-part episode that continues on The Flash: Crisis on Infinite Earths: Part Three (2019).
Supergirl appears in part two of a five-part episode that begins on Supergirl: Crisis on Infinite Earths: Part One (2019).
Ray Palmer, Sara Lance and Mick Rory appear in part two of a five-part episode that concludes on DC's Legends of Tomorrow: Crisis on Infinite Earths: Part Five (2020).
archive footage used for flashbacks