At the Sanzenin Mansion, as Nagi is seen playing a video game, the kanji shown on the back of her jacket has the Turtle (亀,Kame?) symbol that is worn by Goku,KrillinandYamcha from the Dragon Ball series.
Hatsuho Saginomiya & Kokonoe Saginomiya make their first appearance in this chapter.
As Hayate uses "controller slash" on the specter, the specter says "please strap the straps". This is a reference to the straps used on the Wii Remote.