The haunted house looks like the Drummond living room.
This was the final acting performance by Ray Bolger, although he did do hosting work in film and TV documentaries after this.
This would be the first time (Season 7 only) that Dana Plato doesn't appear (at all) during the opening credits. She does return (during the end of the updated intro) for Season 8.
Starting with this episode, Danny Cooksey and Dixie Carter are promoted to series regulars.
John Astin plays the handyman C.W. Astin is know for playing Gomez Addams in The Addams Family, who also lived in a creepy house.