I've told Kumorii about these in game, but here's a small log of the ones I've found.
- Moving left to right can change the layering of zombies, causing zombie corpses who are directly next to each other (left to right) to be indecisive about who is on top.
- In the Apartment, there is an opacity layering bug. In the room with the ammo crate (go right of the stairs), just below the ammo crate will cause a lot of visibility problems. They go away when you leave the tile.
- If you die via being on fire and revive instantly through a medkit, you stay on fire. Usually sputters out around half health.
- Click-shooting while out of ammo does not force a reload, while F-shooting does.