Russell Hornsby injured his leg (Achilles tendon) prior to shooting 'Volcanalis and was written out as being "on vacation". He returned for this episode after surgery to repair the injury.
Opens with the quote, "Tell me O' Muse, from whatever source you may know them", from Homer's epic poem "The Odyssey"
Nolen's Bookstore in the episode uses the same font and signage system--rooms designated by color--as Portland's most famous independent bookstore, Powell's, the main branch of which is located a few blocks from The Armory theater that served as the Nolan's set. The location given for Nolan's is 1st & Davis, while The Armory is on 11th & Davis and one of Powell's main entrances is on 11th & Couch one block away.
One of the muse's previous victims, according to the police reports, was novelist Ellis Harlan, an obvious reference to famous sci-fi author Harlan Ellison
Anton's Studio is number 220, which is the episode number (S2 Ep20).