I could be wrong, but I'm pretty sure Orb clears the secret exit in Donut Ghost House (for some reason), so using Orb in DGH would give you 96 exits.

Technically speaking, it doesn't give you the secret exit; it always gives you the normal exit. It just so happens that in DGH the normal exit is the one that takes you to TSA.

If memory serves, FGH is also backwards to what you'd typically expect