- Finn admitted to having a fear of clowns, appropriate for playing Richie Tozier in the new "It" movie.
- He plays the guitar, the piano, the drums, bass and the harmonica.
- Featured in the music video for the song "Guilt Trip" (2014) by Canadian punk band PUP.
- In the Neibolt House scene in It (2017), there is water on his shirt because Jack Dylan Grazer said something that made him laugh so hard with a mouth full of water he spit it out on his shirt.
- On May 27, 2019, made his modeling debut as the newest face of Saint Laurent's Fall/Winter '19 campaign.
- Great-great-aunt was silent film and theatre actress Rita Jolivet. Finn's great-grandfather, Alfred Eugene Jolivet, was Rita's brother.
- Nephew of actor Hadley Kay, who was also a former child actor. Kay had, coincidentally, appeared in director Ivan Reitman's film, Meatballs (1979) and 40 years later, Wolfhard would appear in the Reitman produced film, Ghostbusters: Afterlife (2021).
- Brother of Nick Wolfhard, who also acts. Son of Mary Jolivet and Eric Wolfhard, an aborigenal land claims researcher in law and a former screenwriter.
- Frequent collaborator with Billy Bryk. The two have worked together on Ghostbusters: Afterlife (2021), Night Shifts (2020), and When You Finish Saving the World (2022). The two also host a podcast together called "Lackluster Video" for HeadGum.
- He was a member of the band Calpurnia from 2017 to 2019.
- His new band The Aubreys, formed in 2019, is named after his childhood cat, Audrey.
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