- Colbert Bump: In an interview, One Piece creator Eiichiro Oda praised the series, declaring himself jealous of it and praising its ability to portray music in its art. Within the day, the series began selling out to the point that the publishers had to order reprints.
- The Danza: Ryota Watari, who is voiced by Ryota Ohsaka in the anime adaptation.
- Dawson Casting: For the film adaptation, averted with Suzu Hirose, Anna Ishii, and Taishi Nakagawa as Kaori, Tsubaki, and Watari, respectively, who were all 18 at the time of filming, fitting their senior high school characters (bumped up from the manga, which has them in middle school). However, it's played straight by Kosei's actors: Kento Yamazaki, who played him as a teenager, was 21, while Kanata Fujimoto, who played him as a seven-year-old, was 13.
- No Export for You:
- The final manga volume, titled "Coda", released alongside the Japanese DVD and Blu-ray releases for the anime, has yet to be published in English, despite being published in French, Spanish, and Italian.
- Additionally, the OVA episode titled "Moments" which was included with volume 11 of the manga, has never been released outside Japan, as tends to be the tradition with manga bundle OVA's.
- Relationship Voice Actor: Kousei is voiced by both actors who voiced Inaho Kaizuka.
- Technology Marches On: In the manga and the anime, the characters still use dumbphones. While the exact In-Universe timeframe is not clearly established, the manga began in 2011, where smartphones are already available but not as widespread as it is (especially in animes) in 2013 onwards. The Live-Action Adaptation has them using smartphones instead.
- What Could Have Been: In an interview with the author Naoshi Arakawa, he said at one point he wanted to change the manga ending he originally planned with Kaori surviving her operation rather than dying. However, he stuck with the original ending since he already told the producer of the anime how the manga will end.
Trivia / Your Lie in April