I've seen tons of minor glitches in game. Here's a few examples.
The common size glitch, when small chars fall through solid objects.
Hanging off the side of a barrel?
I'm under the water and you can see the inside of my face.
Swimming in lava and the only part of my body below the surface that loaded was the claws.
My friend got stuck swimming in mid-air and his body was vertical.
I'm not part of a group, but I got updates from another group in my group channel. (I think this one is most annoying 'cause it keeps going on until you log out.)