I think it's more of a timing related issue. It usually happens to me when someone zones in, or on a "tick" - like the client pauses for a millisecond to load a new texture, but hiccups and refreshes your positional information while turning. I remember this on live as well, once I started using mouse-look. Mouse-look turning can spin you 360deg several times in the time it takes keyboard turning to make one rotation, so the effects are much more apparent using mouse-look.
Example: You're turning 180deg and someone zones in. You were at 90deg when the textures started loading, and 180deg when it's done, but the client refreshes at the 90deg point, causing a "jump."
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