Missing zombies: Hungry, Western, Football, Cheerleader, Biker, Stripper, Fat Hawaiian
Minibike can run over animals for 1 hit kill, can also kill or dismember zombies. Don't hit zombies head on or you stop.
MD5/base deletion bugs.
Crashing
4 player limit, with added split screen play "Couch co-op"
Missing electricity and most traps.
Gain skill in crafting by crafting, start at QL 1.
Combining at work bench gives half as much, but can get to 600 from the start.
No Crucible for Steel, don't need it.
Need Calipers and the Tool and Die Kit to make Rocket ammo.
No wolves, passive Pigs instead of Boars. Flee when hit instead of attacking.
Differences in some crafting recipes, like Wood Log takes 20 Wood to build, or some spikes take much more wood.