The skin-tag type bumps are normal. Frogs puff up their entire bodies prior to shedding and look just like yours did, then they use their back legs to push their skin up towards their mouth. They will also make yawning motions that look like they might be about to regurgitate or something to eat the skin sometimes.
No one said you were inept. Frog's shed is completely transluscent and you may or may not be able to see it, but it looks completely different to the way reptiles shed. I've kept reptiles since I was ten, and thought my frog was about to die the first time I actually saw her shed.