Very nice! Looking forward to seeing more. I like that you have the webcam on at the same time.
To explain some of the bugs you encountered:
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The UI freezes when a new villager joins your town. That’s why they don’t show up in the management dialogs, and why your selection bar gets stuck. You can quickly tell it’s happened by looking at the debugging bar in the bottom right: if it’s not changing the colors around, the UI has become stuck. Save/load fixes the problem, as you noticed.
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The head bug is a tricky one… no known workaround for this one, and it’s one of the more serious ones currently still in the game. The team is looking into it.