(2000) Was the lead writer on the comic book spin-off of the Archie's Weird Mysteries animated cartoon series, contributing stories to all 34 issues over several years.
(1990s) Has written comic book stories based on animated cartoon characters including Looney Tunes, Tex Avery's Droopy Dog, Tex Avery's Wolf & Red, Teenage Mutant Ninja Turtles, Sonic the Hedgehog.
(1998) Contributed a chapter to a book of essays called Midnight Marquee Actor Series: Vincent Price. Castiglia's chapter concentrated on the comedic pairings of Vincent Price and Peter Lorre in Tales of Terror, The Raven and The Comedy of Terrors.
(2009) Is writing a book called Scared Silly: Classic Hollywood Horror-Comedies. Castiglia is blogging his way through the project, wherein he is attempting to review as many horror-comedies as possible made between the silent era and the mid 1960s.
(1988) Is a published songwriter with two songs registered to BMI. Recorded the songs under the stage name Paul Cast.
(2006) Wrote the music and lyrics to the theme song of an animated series in development called FriendFish.