Well, while transforming my YF-19 for the second time, I noticed that mine already had a broken off hip tab from the factory. I didn't even move the legs too far but was wondering why the left leg moved farther forward than the right. And no, I didn't accidentally break it it off if anybody's wondering. Doesn't affect the transformation or playability though.
BTW, not sure if it was mentioned before but watch out for the circle shoulder pieces. One of mine popped off and I just glued it back on. Good thing I have hardwood floors and not carpet. Would have been a birch to look for.