- Keep Circulating the Tapes: Only the first 28 issues have been reprinted via the Marvel Masterworks series, and it's uncertain when or if more issues will be rereleased.
- Milestone Celebration: On the 70th anniversary of this series, issue #1 was reprinted on it's own as a hardcover 70th anniversary edition.
- What Could Have Been:
- The original Sub-Mariner story was intended to be a standalone story, released as part of an aborted comic series called Motion Picture Funnies Weekly, and was only 8 pages long. The comic never took off, so Bill Everett took the story to Timely and included it as part of the anthology, adding four more pages to the story.
- There was a brief point where Timely did consider changing their name to Marvel to coincide with this comic, but the change didn't stick—it would be a couple more decades before they really would change their name to Marvel Comics.
Trivia / Marvel Mystery Comics