The comic book that Kathy Williams is reading in the closing scene is Superman #72 (September 1951).
Ashdown's character, Kathy Williams, is the first person to fly with Superman and in close-up on television. In production order, other flying scenes previous to this episode, on Season One, "Superman on Earth" and "The Human Bomb", used dummies in place of actors to rescue a falling person.
When Superman is flying Kathy to the circus, the scene of the crowd looking up at the sky is the same one used in all of the intros.