hmm...so kyoto animation made a boo boo, it's still one of the best animation studios :P unless you have god eyes, probably noone else would have noticed.
apparently in the OP in the first couple of episodes, there's a similar "helicopter legs" problem that's quite a bit less noticeable imo (since it's faster). And I agree, Kyoto Animation is a great studio - they really improved the visual quality of FMP immeasurably...