- Development Gag: Scattered around some of the maps are newspaper clippings that allow you to read the headlines. One such newspaper features the headline "SUSPECTED CULT" with an image of the Clot as it appeared in the original Unreal Tournament 2004 mod.
- Fan Nickname: GLaDOSH for the Trading Sphere that replaced the Trader during PotatoFoolsDay.
- Prop Recycling: The tractor on KF-Farm is taken straight from Red Orchestra.
Trivia / Killing Floor