1337 Newbie:
LAG, perhaps? Check your connection and the server's connection. If the ping is too high, you'll get that effect every now and then.
Also, I'm pretty sure that LAG and low memory effects can be stacked on top of each other.
Something I'd like to see added to that list is the ability to land a raptor on top of a hellbender/scorpion/leviathan, get out, board the wheeled vehicle and transport it away.
I mean, we have highly-interactive bodies in there, why did they forget the friction?
Also, something that bothers me a LOT is that bot manned vehicle turrets tend to shoot at nowhere for extended periods of time. Also, when in the leviathan, the turrets can hit the leviathan itself, and before you say "turn the freakin' friendly fire off", I'm talking about how annoying is to be hearing yourself saying all day "SAME TEAM!"
And to conclude, I really hate it when any vehicle gets stuck against a wall (specially corners)
But what the heck, I guess it's a very good start