here’s an explanation for the floating bench and gravestone. (Although when that happens for me, usually with tables, I am at least able to move it again afterwards. Perhaps an explanation for them not moving that one is here; alternatively they may suffer from the same issue as dining tables in the last release (but not the fancy chairs, for example) described in that same topic.)
Frozen goblins are reported here—be careful with those, because your footmen will attack them and keep swinging at them in vain, effectively getting your footmen stuck to die of starvation.
The carpenter working on the building I think is not a bug, unless they still had crafting jobs queued up. The carpenter is supposed to help with other things when out of carpentry work; the footmen don’t do this, so if the rest were all footmen, the carpenter would be the only one to ever get any work done on building houses and such.
I know you know these were already reported (or some of them, anyway), I just thought it might be nice to link you there so you don’t have to look yourself. Also, it will show up in the relevant topics, so that your topic here will serve as a kind of confirmation for these bugs especially for the new alpha, as you mentioned in the video.
When you opened the town overview by clicking in the top left, you encounted a UI freeze (always easy to identify by looking at the debugging information in the bottom right: the colors stop changing). The most common cause of this is when you accept a new citizen (or perhaps other notifications?), but this appears to be a different cause. Thanks for the report on this! You can see it in your video also when you do get the actual traveler joining (again, note the debugging tool!).