There is a Wunderwaffe bug for infinite ammo. Once the player builds the parts and grabs the weapon, they can then upgrade the Wunderwaffe then buy a wall weapon to get rid of it. After that, they can grab the Wunderwaffe from the build table again, providing unlimited ammo.

the zombies occasionally get stuck in the door exiting the spawn house, they will get stuck on each other and you have to kill a few to get them out of the house