* ActingForTwo: Christopher Reeve in the junkyard fight.
* BTeamSequel: To the Creator/RichardDonner-helmed ''Film/{{Superman}}'' and (more or less) ''Film/SupermanII''.
* OldShame: Creator/ChristopherReeve felt so ashamed about this movie that he swore he'd never play Superman again. It took lots of persuasion to bring him back for ''Film/SupermanIVTheQuestForPeace'', which sadly didn't turn out much better.
* {{Promoted Fan|boy}}girl: Annette O'Toole admitted in an interview for the documentary ''Look, Up in the Sky!'' that she loved reading ''Superman'' comics as a child, and preferred Lana Lang to Lois Lane.
* RetroactiveRecognition: So Lana Lang [[CastingGag grew up to become]] ...[[Series/{{Smallville}} Ma Kent!]] Really, Annette O'Toole played Lana Lang here and (unbeknownst to the producers of the TV show) Martha Kent to Tom Welling's Clark.
* TechnologyMarchesOn: In one scene, a computer teachers says you can't do two things at once on a computer. Modern-day computers do multiple things at one time as a matter of course.
* ThrowItIn: Reportedly, Creator/RichardPryor was encouraged to ad-lib a lot, but because he was a Superman fan, he mostly stuck to the script.
* WhatCouldHaveBeen:
** According to Ilya Salkind, the original script was going to involve Comicbook/{{Brainiac}} and Mr. Mxyzptlk (who would have played by Dudley Moore) teaming up against Superman, who would also meet his cousin, Comicbook/{{Supergirl}}, who was adopted by Brainiac. The three characters would have been involved in a LoveTriangle, with a jealous Brainiac turning Superman evil and Supergirl agreeing to marry him if he returned Superman to normal. Superman would have made a deal with Mxyzptlk to transport him and Brainiac to another dimension in order to settle the matter without superpowers, which they would have done by jousting in medieval armor.
** The original title for the film was going to be ''Superman vs. Superman''.
** Alan Alda and Frank Langella were both considered for the role of Ross Webster. [[Film/SupermanReturns At least Frank got a role later.]]
** Gus Gorman was meant to be the human guise of Brainiac.
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