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.

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.

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.