Though the villain is commonly referred to as Katazuma, "The Fiesta Ghost is an Aztec Ghost" VHS tape from 1989 calls the villain "Cotazuma." While this could be shrugged off as just a typo, the subtitles for the episode on both the The Scooby-Doo/Dynomutt Hour DVD and the 13 Spooky Tales Around the World DVD refer to him as this too. On the Boomerang streaming service, however, the subtitles call him "Catezuma."
In addition, from "Sandy Duncan's Jekyll and Hyde," the DVD subtitles list Zalia Z. Fairchild (the common spelling I've seen) as "Xavier Z. Fairchild."
Thanks so much to my friend Deandre (aka Scoobyfan4ever) for coming up with this week's fun fact!