Trivia: The Mystery of Mamo
- Dueling Dubs: On the short-list of anime films with the most English dubs made (often attributed as #1). First, William Ross, whose Frontier Enterprises company was hired for the job by Japanese distributor Toho, made a dub in 1979 to show in trans-Pacific flights on Japan Airlines. Next, Streamline Pictures dubbed it in 1995 for the North American market. Then, Manga Entertainment made its own dub in 1996 for the UK market. Finally, Pioneer/Geneon redubbed the film in 2003 using its cast from "Red Jacket".
In 2013, rather than trying to make a dub of their own, Discotek Media simply and wisely collected all four dubs onto their release. This was actually quite a feat, since the Toho dub had to be cobbled together from various extant incomplete copies and then digitally cleaned up to make it presentable, and the Manga UK dub had a very limited release to the point that no one knew if decent materials for it even existed.
- Fake American: Nearly everyone in Manga UK's version, one exception being Lupin's voice actor, William Dufris (who actually is American).
- Franchise-Driven Retitling: In Japan, The Mystery of Mamo was originally titled simply Lupin III, but with two television series, a live-action film, and another movie on the way, they had to retitle it to distinguish what the movie was. It is now officially known as Lupin III: Lupin vs. the Clones.
- Hey, It's That Voice!:
- Due to Frontier Enterprises not properly documenting work on their dub of this film (perhaps among others), this is the only way to verify the Toho dub's voiceover artists for most of the characters. For example:
- The Streamline dub has most of the actors from their previous dub of The Castle of Cagliostro reprise their roles... with the exception of Steve Kramer as Goemon. Instead, Goemon is both The Count and Gustav, as well as Rai Dei the Blade, Jin, and Seiryo Tennan.
- In the Pioneer dub, Mamo was once the Chief of Jiha Village.
- What Could Have Been: For their release, Streamline Pictures originally planned on simply including the pre-existing Toho dub, similar to how they released AKIRA. However, they weren't able to due to copyright issues with TMS, and instead had to produce their own dub.