Adaption Displacement: How many people are aware of the Saber Marionette J audio series? Or the J light novels? Exactly.
Amateur Cast: Many of the English voice actors from J to X haven't done much else. At least a few of them aren't even credited.
Franchise Killer: The controversial Saber Marionette Z manga. The story is that even though it's by then normal with human women on Terra II, maiden circuits are made for every marionette, and some chose to turn evil. The main marionette, Zero, had Combat Tentacles that she used to absorb the other marionettes and gain their skills. It only reached only 7 chapters with a huge Art Shift in chapter 6. It never was collected into a whole volume. It caused such a stir the whole franchise was put on hold until bought in 2015.
Also the J series ended up being dubbed by Ocean in Vancouver instead of Animaze in LA note contrary to popular belief, not the other way around , so the entire cast was changed. Notably, Otaru went from being voiced by a female (Mona Marshall) to a male (Brad Swaile). Then J to X went to Blue Water in Calgary, presumably due to union issues, and the entire cast was changed once again.
The rest of the dubs were more consistent, with two major exections in J Again. In Japan, Kikuko Inoue was on maternity leave during production, and thus was replaced by Emi Shinohara. In Mexico, Isabel Martinon was replaced by Elsa Covián, who ironically played R's version of Cherry. In both cases the original actress came back for J to X