Revealing mistake: When the two Supermen are fighting in the scrapyard: As evil Superman comes flying out of the acid with his hands cupped, look at his cape. It is wrapped around the front of his waist and legs, not flapping backwards like it would be if Supes was flying forward at speed. Evil Superman is also completely dry during this shot (NOTE: Superpowers have nothing to do with this). This reveals the fact that it was shot with Christopher Reeve (or the stuntman) falling backwards into the vat, then shown in reverse.
Other mistake: Towards the end of the movie, when Superman drops Gus off at the coal mine, Gus begins talking with the coal miners about him and Superman. He then rips open his shirt (as if he had a Superman costume on underneath). How did Gus know that Clark Kent tore his shirt like that in order to change into Superman, or keeps his suit under his clothes at all? The only people who know this fact are the ones who have seen the transformation from Clark to Superman, i.e. the audience.
Ross Webster: Congratulations, Gus, old buddy. You're going to go down in history as the man who killed Superman.
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