I can second 1 and 3. Frozen animations aren't limited to digging beams, a frozen frame of a plant being harvested has happened to me, but all such frozen animations have gone away after a while (culled by the game?). I've also seen the the wrong animation being used while sleeping, eating and researching. Usually a tantrum animation, but once sleeping while researching. Had a blank bottle attached to a deactivated unbottler once as well but that sorted itself out too.