* ActingForTwo: Christopher Reeve in the junkyard fight.
* BTeamSequel: To the Creator/RichardDonner-helmed ''Film/{{Superman}}'' and (more or less) ''Film/SupermanII''.
* CaliforniaDoubling: The movie was shot in Calgary and High River, Alberta. Calgary doubled for Metropolis, while High River doubled for Smallville. This continued the trend from the last two films. In fact, the opening to the film takes place in downtown Calgary, as you may notice from the buildings.
* 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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