The exterior of the Kingston Mansion is used in the first season's opening and closing sequence.
Kingston Mansion, which is the setting of this episode, and is in both the opening and closing credits of Season 1 of this series, is based upon Seaview Terrace, the Newport, Rhode Island mansion whose exterior was used for the fictional mansion Collinwood on the Gothic soap opera, Dark Shadows (1966). In fact, the villain "ghost" in this episode looks alot like that series' vampire, Barnabas Collins, complete with an Inverness cloak and hair bangs. He is not, however, portraying himself as a vampire.
The title is a play on the expression, "What the heck's going on?"
Scooby-Doo plays hard of hearing to get out of standing watch for the ghost.