- I Knew It!: Quite a few fans guessed correctly that Christina Kelly would have a major role in the series' dub.
- Meme Acknowledgement: The opening for Umaru-chan R shows an Umaru wearing a pink bunny hood, seemingly a nod to Overwatch's resident Gamer Girl D.Va and the fandom's love of portraying her as an Umaru-like lazy bum (complete with her own chibi "Indoor" form).
- Method Acting: According to her Twitter, Aimi Tanaka records Umaru's instant noodle eating scene by actually doing so in the recording booth. She even mentioned that it made the studio filled with the smell of tonkotsu and made everyone there hungry. This is also done with senbei, although the original scene has Umaru eating potato chips.
- The Wiki Rule: Right here.
Trivia / Himouto! Umaru-chan