Revealing mistake: When Lois and Clark are checking out Lenny Stoke and Derek Camden on Lois' computer, you can see the computer screen showing the script for Lois in that scene. (00:07:40 - 00:08:20)
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.
Superman: But, when I save a life, in that instant, I know two things that most people will never figure out: Why I'm here, and how I can make a difference.
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?