Scripter Gardner Fox reports writing this story originally for All-Star #36. Solomon Grundy's first post-1940's appearance will be in Showcase #55 (March-April 1965), also written by Fox, and it's 2nd page is a Murphy Anderson re-drawing of Hasen's Page B from this issue. That story picks up right where this story leaves off, ignoring Grundy's appearance in Comic Cavalcade #24. Roy Thomas later reconciles these two conflicting accounts in All-Star Squadron #3 (November 1981).
We formerly credited in error Gaspar Saladino (who was in service at the time) with the letters on the main story.