1. Cafe Baltic stalker scream
Go around the map. Now go to Cafe Baltic. Press E on the door and the door will open and close at the same time and you will hear a stalker scream and you get pushed back without pressing S.
2. Admin room
There is a red hall that teleports you a building indoor that cannot be noclipped into. If you noclip into the building, you get teleported back to the spawn. In the building, break a wall spot and you will find a gnome in it. If you crowbared the gnome, it will scream.
3. Father Grigori's ghost
Go around the map. Then find a door. In the door you will find a garage door. If you pressed E on the garage door, Father Grigori's ghost will laugh.
Thats all mates!