Alliterative Name: His first and last name don't start with the same letters, but they have the same sound.
Clothes Make the Superman: During the famous "Panic in the Sky" episode, amnesiac Clark, having discovered Superman's suit under his own, wonders if this might be the case. Unfortunately, Jimmy says no, the man makes the clothes super.
Superman Can Breathe in Space: In "Panic In The Sky", Superman not only flies through space and lands on an asteroid without trouble, but the asteroid itself apparently has birds on it.
The So-Called Coward: Lois constantly derides Clark as a coward, even though in many episodes, he acts fairly brave (notwithstanding the fact that he's really Superman), such as when he headed to Hollywood to supervise a film based on some of his articles, despite knowing he has a price on his head in the area, or when he assisted a doctor in operating on a mysterious "mole man" (who was believed to be radioactive) while outside, a mob was growing to attack the creature.
Unique Protagonist Asset: Superman is the only person with superpowers we ever see (and by implication the only one on the entire planet).
Intrepid Reporter: Perry at times blows his top at the trips she takes to get a story, but she tends to be following solid leads. On at least one occasion Lois was scheduled to be a key witness of a senatorial committee investigating organized crime.