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Trivia: Tim Curry was initially cast as the Joker, and recorded lines for a few episodes, but was later replaced by Mark Hamill. It has since become one of Hamill's signature roles.

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Trivia: The character Harley Quinn was actually created for this series. She prove so popular, she was later integrated into the comics, and has also appeared in live-action feature films like "Suicide Squad" and "Birds of Prey."

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Trivia: The series was animated on darker (typically black) paper as opposed to standard white paper. This helped aid in the show's aesthetic, and also helped save time when animating nighttime sequences, since they wouldn't have to paint the entire background black.

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