I'm confused... I've seen two conflicting sources of information describing how a roof drip edge should be installed.
One source (Ask This Old House), states that a drip edge should be placed above roofing felt: https://youtu.be/dms-qDIUnUQ?t=11m31s
Another source (Handy Home), states that it depends on which side the drip edge it being placed... and the stuff on the sides should be BELOW the roofing felt: https://www.youtube.com/watch?v=YRciDPll_NY&feature=youtu.be&t=2m4s
Is this just a personal preference? Or is one method clearly superior?