Superman (Christopher Reeve) defeats Gus' (Richard Pryor) super computer by using an acid that can penetrate just about anything when exposed to high temperatures (seen earlier in the movie when Superman saves some people at a chemical plant in Smallville). Clark gives Lana (Annette O'Toole) a diamond ring. Lois (Margot Kidder) returns from her vacation in Bermuda. Superman adjusts the Leaning Tower of Pisa.
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.
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