I saw it in Real-D too.
The human scenes have more depth to them in general, and there's this thing when 3D images are too deep and approach the paralell-eye position... and if you're seated in the wrong place it goes beyond paralell eyes and that hurts both eyes and brain.
PC 3-D drivers had calibration for this same reason. To minimize this effect you gotta sit real far from the screen. It also depends on how the projectors are set up so it varies from theater to theater.
about blur, 60fps and "more real".... 24fps has more motion blur to preserve the illusion of movement. Reality has less motion blur than 24fps film, as you'll know it's quite sharp (unless you have eye problems). Really, the only bad thing about 60fps is that it is not 24fps.
Human eye perception hovers just above 100fps, I've read. How they measured that I have no idea.