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Millhouse Underground
A movie that the main characters went to see in The Last New Start chapter 21; expanded on in My Cousin's Keeper chapters 22-24. Tess casually refers to it as "the Cerberus Shark movie".
Comic Books
Noted author Maurice G Kernigan has created at least 3 separate universes in his comic books, all of which have copious amounts of fanon to support large expanded universes. The most popular two are a horror world, and a complex political thriller which is told through the eyes of a dozen highly developed spies, each of whom has adventures in different parts of the world and different strata of society. It would be possible for these stories to take place in the same universe, but it's never explicitly canon.
There is also a third series, about mafia enforcers who start dealing with supernatural threats to their city. This one is a lot darker. There is an ongoing argument (rarely civil) between fans about whether these stories are set in the same universe as either or both of Kernigan's main series; or as his 3 or 4 standalone superhero books.
About eight months before filming started on Tags, Kernigan posted on Twitter (or some equivalent site) that he was really looking forward to it, tagging the executive producer and both directors. This post was deleted after about an hour, and confused many of his fans. It was the first mention of the movie on social media; and came more than a month before it was even suspected that the producer and directors were working on a secret project together. Many of Kenigan's fans (including Ffrances Jones, who is a huge fan) then started speculating about which of Kernigan's series the movie was going to be based on.