Most bugs I have seen have already been reported, but:
I once ordered the construction of a bed and then ordered the destuction of the blueprint, result: The one trying to construct the bed got stuck and eventually died. (Getting stuck is still possible.)
Using seed BUNNY for a 60x60 map generate a map without water. (An example of maps without water is still possible.)
When a botonist is harvesting the game still freezes for a few seconds.