Accidental Innuendo: Lampshaded in the marathon episode. Shiro races out way ahead only to turn back because he's run out of white powder. Kou warns him that he shouldn't say that out loud in case a policeman hears him.
Takai is sometimes the Team Dad for Rec and the Ichinomiya company, but other times he looks like he has a serious crush on Rec. He has a body pillow of him, and there are other times he acts too clingy.
Hoshi and Rec get way too invested into Billy's manliness. Heck, they aren't the only ones — one of Billy's lackeys has a crush on him (similar to a bird's imprinting), and in his introduction, he even got jealous of Jacqueline.
Everytime that Rec, Hoshi and Last Samurai get into their Kameari-tis "influence", with their fangirl obsession over Kameari.
Kameari seems to have connected with the Venusian ghost (a.k.a. Nino's twin) in a deep, deeper level due to their love towards nudity.
The live-action Mayor and Hoshi who appear in episode previews. Take account they are prop masks that look as realistic versions of the characters' masks, but they don't move as their animated or drawn counterparts... making them even more creepier.
The drama and its movie sequel don't follow the live-action aesthethic used by Studio Shaft in the anime for Hoshi or the Mayor, and the staff decided to go for make-up for the characters... but it's not a pleasant experience seeing the heavy yellow and green make-up on Takayuki Yamada and Shun Oguri's faces, respectively.