(24:25) When Xander and Nancy survey the damage to the flooring in the corridor, the hole that the demon rose from is now only about 30cm deep and lined with black polythene.
Anya was convinced (off screen) to reverse a curse she placed on a man which turned him into a giant predatory worm. Later, in Buffy the Vampire Slayer: Selfless (2002), it is revealed that reversing a curse performed by a vengeance demon can only be done with the sacrifice of the life and soul of a vengeance demon. Nothing of this is mentioned and Anya appears to have accomplished this without any repercussions.