From Combine OverWiki, the original Half-Life wiki and Portal wiki
- ...that Half-Life: Decay was supposed to ship with twelve levels, but three missions were cut?
- ...that Valve artist Ted Backman gave his likeness to the Citizen variant "male 02", as well as an early version of the Black Mesa security guard?
- ...that the Turret Redemption Lines are not rides?
- ...that the Fast Zombie has its origins in the Alien Assassin?
- ...that the Combine are led by Advisors?
- ...that the Bullsquid hates Headcrabs, and even its own kind?
- ...that Test Subject 042 was a chicken?
- ...that the rules of the swimming pool in the Level 3 Dormitories' Aquatic Center are "No running", "No horseplay", "No food or drinks", "No smoking", "No glass containers", and "No nudity"?