Downer Ending: Panty and Stocking are zombified (as are the demon sisters), Garter is beaten and turned into a zombie buffet, and it is clear that they aren't changing back. Good thing this episode ends up being a case of negative continuity.
Weaksauce Weakness: Killing the ghost zombies is like killing a regular zombie which is destroying their heads. Stocking is disappointed to find this out.
Tropes in 1 Angry Ghost:
Big Damn Heroes: After getting electrocuted, the monkey attorney becomes intelligent enough to point out the flaws in the prosecution's case, prove Panty & Stocking's innocence, and expose Scabty, Kneesocks, and Mrs. Wife as the true culprits.
Running Gag: The monkey keeps trying to eat Panty's hair, thinking it a banana. At the end, he finally does.