Hey, It's That Sound!: If you're a fan of the Unreal games, you'll notice that there're several event/weapon/explosion/ambient sounds carried from older Unreal games. Hell, you can even hear some sounds from the first Unreal game in some stages of Unreal Tournament III.
Keep Circulating the Tapes: The whole series was taken off the digital storefronts on the 14th of December, 2022. After this, it's no longer possible to purchase the game through legal means.