- Casting Gag: Invoked — In the web DVD commentary of episode 1, it was confirmed that Crunchyroll requested Bang Zoom record the dub because of their experience with ONE's other hit series. The ADR director and one of the writers for OPM were brought on board for MP100, and Max Mittelman (Saitama) and Erik Kimerer (Sonic) ended up voicing Ritsu and Teru.
- Executive Meddling: Just like what happened with the Latin American Spanish dubs of Miss Kobayashi's Dragon Maid and Free!, the decision of using Japanese honorifics there was forced unto the voice actors' throats by Crunchyroll, due to internal policies of the company, according to the people who worked on the dub. This is later subverted, as the honorifics were removed from the dub starting season 3.
- No Celebrities Were Harmed: According to Chris Niosi and Kyle McCarley, Jim Carrey and Michael Jackson were somewhat of an influence on their voices/acting for Reigen and Mob.
- The Other Darrin: In September 2022, Crunchyroll confirmed they would be recasting a large portion of the English version's cast for the third season, including Kyle McCarley. This happened, in McCarley's own account, because Crunchyroll refused to negotiate a union contract, or even to meet with the union at all.
- Relationship Voice Actor:
- Shout-Out: According to Chris Niosi, several of Reigen's quips as well as some of his grunts were inspired by several shows / celebrities he watched such as Dexter's Laboratory, Rick & Morty and Ed, Edd n Eddy.
- The animation when the Body Improvement Club uses their muscles to squish Sugimoto, the bully trying to mug Mob, is a Shout-Out to Kaori's death scene from AKIRA.
- The Wiki Rule: Mob Psycho 100 Wiki.
Trivia / Mob Psycho 100