There are actually two screw ups, but only one is major.

Okay, so for my mod I wanted the player to have to gather five Dragon Hearts (an item i made) from five of the dragons at the dragon shrines with Dragon Walls. So, i went to the dragonshrine environments, found the dragons, and replaced them with my own Form, which only differed from them in that they had a different DeathItemDrop which would include a Dragon heart. Unfortunately I never got this working. I don't know if Dragons have some funny thing messing with their drops, but even though it would preview as dropping in the CK it would never work in game. Oh well, I gave up on it and started doing other things.

I had a horrible realization today. When I changed the Form of the dragon, I may have screwed up their respective Dragon Walls.

I checked, and indeed I did. I can't get Words of Power from any of the five locations I modified, and presumably neither will anyone using my mod. Is there any way to fix this? Maybe some way of setting an entire cell back to default Bethesda settings?

HALP!

I think you can check all the elements you modified by going to Data (Open), click on your .esp, click the "Details" button, and then delete (del) each entry corresponding to your unfortunate modifications
(I think you need to reload the esp to effectively delete all the stuff)
I hope it helps !

Thank you kindly, that does help.