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This episode along with "The Return" and "The Greatest Story Never Told" was released on DVD as Justice League Unlimited: Joining Forces.
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Christopher McDonald also played a future, aged version of Superman in Batman Beyond, in the episode "The Call".
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Eric Roberts reprises his role of Mongul from "War World." Christopher McDonald reprises his role of Jor-El from Superman: The Animated Series. Mike Farrell (briefly) reprises his role of Pa Kent from Superman: The Animated Series and the JL episode "Comfort and Joy."
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Krypto makes a brief appearance in Superman's dream and General Zod gets a name check (see Recap).
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Kal-El's wife's name is Loana...presumably a combination of the first names of Superman's two most notable love interests, Lois Lane and Lana Lang. Also, Loana is voiced by Dana Delany, who has voiced Lois Lane on previous episodes of Justice League and Superman: The Animated Series.
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This story is loosely based on Superman Annual #11, "For the Man Who Has Everything" by Alan Moore, with art by Dave Gibbons. Both are credited here.
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Wonder Woman's famous Invisible Plane appears (sort of) for the first time in the series.
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Mike Farrell is credited as Pa Kent but isn't seen on screen. During the fantasy sequence, Jor-el says a line in Pa Kent's voice right before Kal-el and his son go upstairs. Christopher McDonald says, "Go on up with your father, Van," but Mike Farrell finishes, "I'll be along in a few minutes." If you turn the closed captioning on it even says "[Pa Kent's voice]" when he says the line.
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This is the second time Batman has been trapped in an "ideal dream world" where his parents survive. The first time occurred in the Batman the Animated Series episode "Perchance to Dream", and was done by the Mad Hatter.