All other parameters that I am aware of (layer maps, fields, disperse, etc) that could affect the particles are off.
As the camera moves through the particles they appear to have a vertical jitter or wobble - looks almost like a field issue, they bounce up and down frame by frame. I hope you can see what I mean. If you step frame through the animation around 2:00 you can see it.
I don't believe there are any settings that should cause this; I need a smooth motion here.