[3] He has also written non-fiction text articles for magazines and books on pop culture, has recorded music under the name Paul Cast, is a documentary film producer, and is the co-writer of two animated series, Thomas & Friends Adventures for Mattel Toys, and Cocoa Talk for Minno.

Paul Castiglia has been editor and writer on comic books including Archie, Teenage Mutant Ninja Turtles Adventures and Sonic The Hedgehog.

As recounted in his introduction to The Love Showdown Collection ("A Funny Thing Happened on the Way to San Diego"), Castiglia conceived the idea of a storyline that would have Archie choose between Betty and Veronica "once and for all" as well as the denouement of the story in which Castiglia suggested the company revive Cheryl Blossom as the "wild card" character that Archie actually ends up with at story's end.

[6] Castiglia is the co-writer of the animated web series, Thomas & Friends Adventures which Mattel Toys which launched on YouTube in early 2017.

Castiglia has written non-fiction text articles for magazines and books on pop culture, including a chapter in Midnight Marquee Actors Studios: Vincent Price.

For With Great Power Castiglia was one of several who wrote tales about the same copy of Amazing Fantasy#15 (the comic book that featured Spider-Man's first appearance) being passed along from owner-to-owner.

The initiative is an outreach to children encouraging and engaging their imaginations through the reading and creating of comic books and other creative endeavors.

[12] Castiglia provided editorial guidance to Shira Frimer for her graphic novel Nistar which tells the story of a superhero for children with cancer.