Trivia: Ashita no Joe
- Defictionalization: When the two characters who died in the ring did so (Rikiishi and Joe), both had real-life funerals held for them by fans. That is how popular the manga was.
- He's Just Hiding: Believe it or not but when the manga had been completed, Joe's fate was actually hotly contested as the readers didn't know whether he was alive or if he had died. It even took Word of God to confirm Joe's death at the end of the volume.
- Retroactive Recognition: Norio Wakamoto as Ryuhi Kin.