Revealing mistake: When Elsa is waiting in the lobby, she's wearing a dress which shows her normal, not wooden legs. It's very apparent when she is crying on the floor.
It's My Party and I'll Die If I Want to - S2-E13
Continuity mistake: When Aidan is put in the casket at the end of the episode, his hands are tied behind his back, but when he is dug up in the next episode they are untied in front of him.