Your style has something very unique and I really like their expressions
All good things are THREE. So: Of course it's better to have three ears instead of just two and besides: Maybe three ears gonna be the fashion of this season now.
However: I have seen that too. But I don't blame anyone because I know FLASH can be a very tricky program and sometimes it can be really hard to work in it.
BTW: Silver Spoon seemed to be more "mean" than ever before inside this scene. She really burned Scootaloo. You know what: Maybe this isn't a third ear but one of two little impish horns which are about to grow on her head. I just don't blame her too much because it was Diamond Tiara's (!) idea.