- Bonus Episode: The 14th episode, "Final Frontier", was released in Japan on December 22, 1999, five months after Dual! finished its run on WOWOW.
- Directed by Cast Member: Besides directing the English dub, Joe Romersa provided additional voices.
- Franchise Ownership Acquisition: As with Pioneer LDC's Tenchi Muyo! titles, the series is owned by NBCUniversal, who bought out Pioneer LDC/Geneon from Dentsu in 2008.
- Milestone Celebration: The Discotek Blu-ray release coincides with the 15th anniversary of the show.
- Network to the Rescue: In late 2023, Discotek Media announced Dual! would be released on Blu-ray in North America for the first time in February 2024.
- Written by Cast Member: Ken Sanada's English voice actor, Kirk Thornton, also served an ADR scriptwriter.
- You Sound Familiar: From the Tenchi Muyo! franchise, Kenichi Ogata (Azaka) is Hiroshi Rara and Yuko Kobayashi (Washu Hakubi) is Akane Yamano.
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