Other mistake: Throughout the episode, including the very first shot, we see the sun is shining brighter and hotter than usual. This lends credibility to the theory that Superman's powers are responsible for increased solar activity. Later on in the episode it is revealed that the heatwave is being orchestrated by Lex Luthor, who is is heating an underground river to coincide with Superman using his powers. Lex does not however have any control of the weather, and no explanation is offered for why the weather conveniently 'played along' with his plan.
Lois & Clark: The New Adventures of Superman (1993)
1 other mistake in season 1
Starring: Teri Hatcher, Dean Cain, Lane Smith, K Callan
Revealing mistake: There are numerous times throughout the series where the supposed big city of Metropolis is actually just a back lot set and none of the buildings are more than a couple of storeys high. Quite often the green hills of Southern California can be seen beyond the set and between the buildings.
Tempus: Oh please, I'll go to jail, I'll strap myself into the electric chair, just don't make me listen to this.
Brutal Youth - S4-E5
Trivia: Jack Larson, who played Jimmy Olsen in "The Adventures of Superman" in the 50s, portrays Jimmy Olsen as an old man.
Honeymoon in Metropolis - S1-E11
Question: Why did Clark destroy the video tape?