Most popular superheroes of the time promoted the U.S. war effort in one way or another. But Clark Kent was rejected as 4F by the Army because his super vision caused him to read the eye chart in an office next door. Instead, he and his alter ego encouraged Americans to buy war bonds and contribute to other patriotic endeavors.
Jackson Beck, who voices Bluto in this cartoon, was the announcer for The Adventures of Superman radio program at the time this cartoon was made.
Olive is reading a Superman comic book when the short opens.
While Olive reads the comic book early on, parts of the actual Superman theme can be heard.
The would be superhero wears gloves and black underwear, something the actual Superman did not. And, of course, he's lacking the emblem on his shirt.