The M2 Flamethrower is available exclusively from the mystery box. It has unlimited ammo, but needs to recharge after using a 100%. The pack a punched version is the F1W Nitrogen Cooled, and is almost impossible to drain completely.
The F1W had a coding error where points are subtracted from the score instead of added, in incriments of twenty every second until the zombie dies.
The flamethrower stream does no damage, only the resulting fire on the zombie itself does damage. Same holds true with the F1W.
Grabbing the flamethrower from the mysterybox in 1.2 Alpha PSP will kill the game.
Sometimes when using the flamethrower and error appears, reading Sounds/knight/pain1.wav not preached.
The magazine for the flamethrower and F1W will always show what is in the magazine of the other gun. (See photo below.)