While it's clear that Don Knotts guest stars in this episode to the audience, what's unclear is whether or not he's playing himself or look-a-like Homer Pipsqueak. His surname is used as a play on words in the episode's title, and at the beginning of the episode Scooby thinks he sees Knotts in the bushes, but no one believes him and when Homer reveals his true identity only Scooby thinks it's Knotts, but is quickly corrected when the detective only gives his name as Homer Pipsqueak. Interestingly enough, Knotts's caricuture in The Spooky Fog of Juneberry was also a law enforcement officer.
Captain Moody's nieces (and one remaining nephew) never showed up to the feast.
When Shaggy and Scooby are chased back to their bedroom in Moody Manor by the Ghost of Captain Moody, Scooby closes and locks the door. After he realizes Shaggy is still in the hallway, he opens it back up, to which Shaggy shuts it and jumps into bed. When the camera returns to Scooby at the door, the door is somehow wide open again.
The gang runs inside the closet in Daphne and Velma's room to hide. When they realize the Ghost is in the closet, they all run out, except Daphne. When the Ghost of Captain Moody floats out, the camera shows the whole gang, including Daphne, a moment later, cowering by the door, although Daphne never actually left the closet.