There's some strange quirks with the network code.
For one, unless you move forward or backwards, your characters direction is not updated to other players
For example, if you are spinning around in place, to everyone else, you're just... standing there.
This, I think, is only a problem when using the Right CTRL to change your running mode.
If you use this mode to adjust your characters direction, nobody else will see it, you'll look totally different to them.
Some of the other glitches are understandable as they're just the effect of updates being spread out, and not rapid. (to save bandwidth I suppose)