Trivia: Gunslinger Girl
- Hey, It's That Voice!: Henrietta is voiced by Laura Bailey (Chun-Li from Street Fighter IV, Sonoko Suzuki/Serena Sebastian in Detective Conan, and Serah Farron in Final Fantasy XIII and the sequel).
- No Export for You: The PS2 gaiden games aren't going to be released out of Asia. It only features a couple of characters, the cyborg Pia and her handler Earnest. They don't appear in the anime/manga version of Gunslinger Girl.
- The Other Darrin: In an inversion of the norm, the second season and OVA feature a completely different Japanese voice cast, but retain the exact same English one with the exception of Hilshire.
- Playing Against Type: Rico in the first series is voiced by Kanako Mitsuhashi... or let's say... Killua Zoldyck? One YouTube user who uploaded Rico's character song  pointed this out and claimed, "It's really pretty. But if you imagine Killua or Kouhei singing this, you'd probably choke."
- Relationship Voice Actor: Henreitta and Triela are voiced by Laura Bailey and Caitlin Glass in English dub. Therefore, they're Shin-Chan and Miss Anderson, Kanako Kasugazaki and Haruhi Fujioka, and finally Chun-Li and Cammy.