Despite airing immediately after the cliffhanger "Fungus Among Us," this episode does not continue the story. It is, as yet, unclear where this episode fits in the show's timeline.
The fat lady singing in the last Halloween song has a costume that is modeled after the haunted mansion opera singer ghost
Savannah dresses up as Samara from The Ring (2002) who was in turn was played by Daveigh Chase who provided the the voice of Lilo in Lilo & Stitch (2002), which was also made by Disney.
Dakota says, "Beware the Ides of March" which is a reference to Shakespeares' play, "Julius Caesar".