Template:Didyouknow


 * ...the tattoo on Francis' shoulder can also be seen on the ring Nick wears on his right hand possibly hinting a connection with the two.
 * ...the Hunter doesn't have eyes. Despite this, he can still somehow see.
 * ...the coffee mugs found in various levels that state "Layoffs anyone?" and "What's Sleep?" are imported directly from Valve's Counter-Strike?
 * ...Bill is the only one in the introduction video to wield a tier 2 weapon.
 * ...the Charger hanging in Swamp Fever is done so in the shape of a Lambda, which serves as the logo for Half-Life?
 * ...there was originally an Infected in Left 4 Dead called the Screamer. It would wander around until spotting the Survivors and would then run away and utter an ear-piercing scream that summoned a horde. He was later cut and his ability was passed on to the Boomer.
 * ...the pills used in-game were based directly off of the Target brand of Ibuprofen?
 * ...in the original development, there was no linear path in Left 4 Dead campaign chapters and Survivors were free to roam the city before finding the safe room? This however proved to be too confusing as play-testers found themselves lost amongst the levels.
 * ...an X-ray found in Mercy Hospital bares a striking resemblance to that of a Spitter?
 * ...Francis has a Lambda shaved into the right side of his hair?
 * ...In the very first trailer of Left 4 Dead, Bill is killed by the early version of the Smoker, who popped up and clawed him to death. First the Smoker can be seen behind him, than there are two struggling figures in the dark, one performing Smoker's clawing animation. Next second, blood sprays on a car.
 * ...Bill's trademark cigarette never goes out unless he's either dead, or at the beginning of the introduction video?