Jimmy says his father was a ham radio operator and he used to use "Jimmy the Infuriator" as a "handle." Ham radio operators are issued callsigns consisting of simple letters and numbers from the FCC and required by law to use them. Handles were more commonly used among CB radio enthusiasts which have significantly more lax enforcement after the massive surge in popularity in the 70s.
When Clark showed up at the Daily Planet, he got there using super speed, which usually brings wind and causes papers to go flying, but the paper Chloe was holding did not move. You can hear the wind though.