Dummied Out: When the game was announced, a screenshot of the main menu was released, which showed a "Story Mode" and an "Extra Story". However, when the game was released, there was no Extra Story in it.
Reality Subtext: ZUN mentions in the afterword that he got the idea for Unfinished Dream of All Living Ghost from seeing the rise of AI such as ChatGPT that promised ultimate efficiency, but at the cost of organicity and life. In this way, Zanmu's plans for Gensokyo, Hell, and the Animal Realm can be seen as analogous to an AI, as she prioritizes efficiency above the individual wants of Gensokyo's inhabitants, and has everyone dance to her design.
What Could Have Been: Due to both the workload and the fact that some of them could be considered spoilers, ZUN was unable to fully explain certain game mechanics in the game proper, instead placing them in the Afterword omake.
General Trivia
This is the first Windows Touhou game to not have proper profiles for returning characters, due to the sheer amount of them, so their story intros serve as the profile instead.
was released, which showed a "Story Mode" and an "Extra Story". However, when the game was released, there was no Extra Story in it.