I had a weird crash bug related to hospitals and beds. After witnessing my in-the-last-minute recruited soldier defeating his berserk friend I went upstairs and removed the beds inside my hospital, and removed the hospital zone. I unpaused and two seconds later the game crashed.
I did the same thing again, yet another crash. The same thing happened the next time.
I then waited a while to see if it would occur without me removing the beds. It didn't. Then I tried to crash it again, but it stayed stable. After a while, though, I see a dwarf running up to the hospital. Instead of removing the bed, he goes to sleep in it. The game immediately crashed.
Beds not in a hospital/ex-hospital that are about to be deconstructed doesn't seem to crash the game.
I haven't noticed any fish in the game yet.
There are a lot of giant cave spider nets in the first underground level, but no such spiders as far as I have noticed.
Things seem to take a long time to rot away.
Are lakes supposed to flicker this much? The reflection effect or whatever it's supposed to be is all over the place, but it's my first time embarking at a lake so this might be natural. I'm pretty sure it shouldn't be present at the bottom of the lake however.