Worsel, I was also sure Rumpel was going to tell Zelena that she loved herself. To me, it really fits better with her sudden onset of hatred for Regina (and her father, maybe?). If it's all about her, it seems easier to believe that anything can "earn" her ire. Regina did it merely by existing.
BTW, that scene with Zelena and her father ... did that seem off to anyone else?
I caught that too! Plus there was the exchange about not wanting a present and getting it anyway. Nice callback.
Oops. Forgot to address this. I'm pretty sure it's Rumpel. She has twice mentioned his brain and Rumpel and Scarecrow have straw in common.