Not sure if these have been mentioned yet, but these are all bugs I have experienced and some other players on multiplayer have noticed them too.
1. Posters: When I first log into a server and hold a blank poster, I open the menu to choose an image, but none of my saved or previously used images are there. If I simply log out and back in, they become visible in the menu.
2. Sailboats: they seem to work flawlessly, but when in multiplayer on a server, I notice the sails and rudder (steering) become rubber-band like when a second player sits in the boat. Moving half way and jumping back even though the key was not released nor the sail fully unfurled. As soon as they jump out, everything goes back to normal. Also the second player does not remain on the boat if unseated, even though the driver remains on the boat when unseated and under-way.
3. Doors: When spawning in or respawning after a death, doors will appear to open but only visibly and not physically. Additionally the physical door remains unmoved, giving the visual that two doors are in place of one, the physical and visible remaining shut and the visible (ghost) being open.
4. Headlamps: the light from another players headlamp seems to flicker and strobe through blocks. I have not heard of other players having this issue, but remains consistent. When ever I have visitors to my town and their lamp is on, it seems to happen. However I don't seem to hear anything like that from other players.