The first race starts around 3:45 where the animation for Sonic's quills still plays smoothly. After he lands the first jump around 3:52 the animation will start skipping frames, it's most noticeable when going straight like in 4:02 and 4:40. Hopefully that helps.
There's a small issue in Sonic Riders Zero Gravity where after jumping off a ramp the wind flapping animations for characters' quills and the like will look choppier and will stay like that for the rest of the race. It's nothing game-breaking and I didn't see any other glitches, but it is...