Headscratchers / Scooby-Doo! and the Witch's Ghost

• Was the green ghost meant to be Sarah Ravencroft?

• Which witch's ghost is the titular Witch's Ghost? The real one or the fake one? Or does the title refer to both?

• Why is the same element referred to twice in Earth, Wind, Fire and Air (Wind and Air)? Couldn’t they have had "Wind" replaced with "Sea"? Earth, SEA, Fire and Air?
  • Perhaps "sea" doesn't sound as mystique as "wind".
• What were they thinking not sending the Mayor, Mr. McKnight, and everyone involved in the Witch conspiracy to jail? Scooby-Doo is supposed to arrest culprits, not forgive them just like that. And the lack of tourists was a pathetic motive!
  • Getting Thorn's daddy arrested after she'd saved the world would've been pretty ungrateful, wouldn't it?