The episode was recorded on June 14, 1989.
When this episode was aired, DIC was contacted by Dan Aykroyd. He and Harold Ramis were impressed by the originality of the concept that a ghost had come into being through peoples' belief in them.
The episode features several references to and appearances of characters in the Sherlock Holmes universe. The references are not confined to one particular story or film, but Moriarty's "hound" may refer to the Hound of the Baskerville.
Reichenbach Falls is a series of waterfalls in central Switzerland. In Arthur Conan Doyle's short story "The Adventure of the Empty House," Sherlock Holmes defeated Professor Moriarty on May 4, 1891 at Reichenbach.