The pilot episode shown last week was different than the Vampire Diaries back-door pilot and Director's Cut shown on Hulu.
Whereas the back-door/Director's Cut from from Claus's viewpoint, the First episode is from Ethan's viewpoint, and has some new stuff, including a completely different ending.
So if you skipped the first episode (because you saw the pilot on Vampire Diaries or Hulu), you'll want to go back and watch it.
I had planned to skip it, but caught the last part on a re-airing and saw it was different. So I went back and watched the whole thing and saw it was different (especially the end).
Vampire Diaries Back-Door Pilot - Story from Claus's veiwpoint
Director's Cut (on Hulu) - Same as Back-Door Pilot, with Vampire Diary specific scene's removed, and scene with young witch in attic added at end.
Official Pilot/First Episode - Story from Ethan's viewpoint, several new and changed scenes. Completely different scene at end involving Claus & Ethan, plus scene with young witch at end has been changed.