There's all sorts of character hats and paraphernalia in the background, many of which can't be discerned properly unless viewed at original size. (I didn't spot hotate-Hatate until I viewed at 100%, for instance.) Besides the items already tagged, I see the following in the background: Meiling's hat star (well, "star" is tagged; I'm not sure if there's a specific tag for HER star) Flandre's Laevatein Letty's trident pin Aya's tokin hat Keine's hat (again, not sure if it has its own tag) Reimu's gohei Sanae's gohei Kanako's onbashira (maybe; that octagonal stick over Eiki's shoulder) Hatate's(?) cell phone and numerous jack-o'-lanterns, of course