Kurohyou 2 features a song which Ukyo can sing in the karaoke mini-game titled "Majima no MajiROCK", which features the voice of Goro Majima and his character profile on the song cover. Goro Majima is a character from the first Yakuza game who has appeared in every single mainline title since, but never made an appearance in either of the Kurohyou spin-offs besides this cameo, implying that he had to have recorded this song himself at some point.

While it’s widely believed Like A Dragon: Infinite Wealth is the first game in the Like A Dragon series to feature a portion set in the United States, there was actually a cutscene at the beginning of Kurohyo 2: Ryu ga Gotoku Ashura-hen set in Las Vegas, Nevada.

The game files contains three unused songs that don't play anywhere in the game. It is unknown what their names are or who composed them.