I went through FiM and pulled out clips of Derpy Hooves based on this site: http://mlp.wikia.com/wiki/Ditzy_Doo
I left out some because she was hard to see (such as being too far away) and left in some where you have to pause and look for her.
Appears on these pages
are Favorite Derpy, or the other name as the title above! I've seen other ponies with the same...