When "killed", zombies will rise after a while and continue attacking the player. Miscellaneous differences between the E3 Alpha and retail. Attempting to spawn the Railgun crashes the game. This weapon is completely absent from the retail release. Interestingly, the game's files reference a weapon named the Railgun. While it exists in the game's files, it has no model and spawning it crashes the game. Hand grenades can be spawned but they have no first person model. The BFG 9000 lacks sound effects, and uses the BFG 10K model from Quake III Arena. The Rocket Launcher lacks sound effects and uses the Quake III Arena model as a placeholder. The Plasma Gun has no audio, and uses its Quake III Arena model counterpart as a placeholder. Instead of the Chainsaw in the retail release, the Gauntlet from Quake III Arena is used as a placeholder. The Machinegun looks very similar to its retail counterpart, except it has different sound effects and the ammo counter display is different. When reloading, it only loads in one shell at a time, whereas in the retail release two shells are loaded. 
The Shotgun is both visually and audibly different from the retail release, using a different model and sound effect. The Pistol has a noticeably different texture and uses completely different sound effects. Some other weapons, while it's possible to add them to the game via console commands, use placeholder models and/or don't work.
Only a few weapons, Pistol, Shotgun and Machinegun are fully functional and they use different sound effects compared to their retail counterparts.
e3_2 - Contains some early versions of locations that eventually ended up being used in the retail's Alpha Labs levels. e3_1 - Possibly an early version of Recycling. The way the scripted events work makes it fairly clear that the demo was meant to be played in a predefined way for show as, for example, near the end of e3_1 a Hell Knight comes out of a dark corner, in the E3 Demo Video, the player hides from it in the shadow to avoid being noticed, in reality it cannot be interacted with in any way. The alpha consists of only 3 levels, they all contain scripted events and some form of cutscene. The executable file icon is completely different from the final version. Almost all weapons and monsters use completely different sound effects than the retail build. The HUD is considerably different from how it looks in the final version. The title screen is completely different in this build.
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