Trivia

The six letters in the word Shazam stood for the six Elders who granted Billy their powers: Solomon, Hercules, Atlas, Zeus, Achilles and Mercury.

Jackson Bostwick was fired two episodes into Season 2 and replaced with John Davey. Bostwick had been injured during filming, got medical treatment, and was advised to stay home for a few days to recuperate. Producers accused him of holding out for a higher salary. Bostwick successfully sued Filmation, which was forced to pay his full salary for the entire series, including all of its reruns, on CBS.

Jackson Bostwick said that when he was fired from the series, the producers told him that since it was a kid's show, most viewers would not notice another actor replacing him. Bostwick believed that most kids were smart enough to tell the difference, and he was largely proved correct.

Billy Batson's work in radio from the comics was only mentioned once in this series. A brief line spoken by Billy in its first episode explained that radio station WHIZ had sent him on a roving assignment to do stories about American youth, with Mentor as an advisor.

In 1939, Fawcett Comics published an ashcan edition of a comic called "Flash Comics" #1 and "Thrill Comics" #1 purely to secure copyrights for their Superman rival, but the names that were used were already in use elsewhere. The name of the main character was changed to "Captain Marvel" and the title of the magazine was changed to "Whiz Comics". "Whiz Comics" #2, reprinting the stories from the earlier ashcan edition, was printed for distribution in late 1939, and cover dated February 1940. After a successful lawsuit by DC Comics, the character disappeared for more than 25 years. After gaining rights to the character, DC relaunched him in the comics in 1973. By then, Marvel Comics had launched an unrelated character named Captain Marvel. As a result, DC's character was called "Shazam!" As of 2007, "Shazam!" is used on all DC publications featuring the original Captain Marvel.