Abandon Shipping: The ending of J to X has all the three marionettes regress into a child and erased their memories, effectively demoting them from potential love interests to adopted daughters to Otaru.
Anvilicious: J to X had such a blatant antideforestation episode that most viewers already got the message in the first five minutes.
Big Lipped Alligator Moment: In J to X there is a flashback episode where while the Marionettes are remembering their origins, Bloodberry has a memory of her being berserker and gets dizzy. This is never brought up ever again.
Bait-and-Switch Lesbians: During her Heroic Sacrifice, she realizes that her love of the oceans came from her awakening underwater — meaning that her feelings for Lime were completely platonic, y'know?
Hilarious in Hindsight: In the english dub, Paul Dobson plays both Faust and Hess, something that has happened in this dub only. How is this an example of this? Because in the light novels Hess turns out to be the original Faust.