On sale date as listed in the Catalog of Copyright Entries, Periodicals, January-June 1963, page 191, registration number B26159.
Bob Klein, Gene Reed, Mike Tiefenbacher, and Bob Hughes credit pencils to Dick Dillin. Craig Delich and Pat Lang credit pencils to Jim Mooney.
Letters credit from Todd Klein via his Klein Letters blog (18 September 2016, http://kleinletters.com/Blog/ira-schnapp-in-worlds-finest-comics-part-1/).
Public service announcement that ran in the March 1963 (cover dates May and June) issues of DC Comics. Printed in black-and-white on inside front cover.
Craig Delich and Pat Lang say Jim Mooney inks. 2/05
The Aqua-Girl in this story is not the one who would later become a regular supporting character.
Writer id by Martin O'Hearn. On page 4, panel 4, Speedy's costume is mistakenly colored green with red gloves instead of red with yellow gloves.