The Verse of the six films in KevinSmith's New Jersey Trilogy. It is virtually identical to the "real" world save for a few key differences — some hidden (active divine and infernal forces) and some visible ("Mooby's" fast food chain and several other multinational corporations). And the occasional giant poop monster.
The Askewniverse films are as follows:
The comic series Chasing Dogma, which bridges Chasing Amy and Dogma, and explains just how Jay and Silent Bob ended up in Illinois;
Various director commentaries point out things never explained in the film, like Brodie Bruce and Randal Graves' relationship (they're cousins), or that Rick Derris is Jay's older brother.
Brand X ("Nails" cigarettes, Chewlie's gum and Mooby's restaurants, among others)
Cameo: Jay and Silent Bob have a short cameo on the movie set of the Show Within a Show "Stab" in Scream 3. Then, when in ...Strike Back, they interrupt the filming of a fictional Scream sequel to rescue their monkey.
That scene is a lot funnier since Scream 4 was released.
Book Ends The 'Verse begins with Clerks and ends with Clerks II and as a result, begins and ends with scenes filmed in black-and-white.
Deconstruction Fic: The fandom tends to explore the dark side of Jay and Silent Bob, who are generally considered a simple comic relief duo. Themes include tragic back-stories to explain Jay's outlandish behavior and Bob's silence, the realities of drug use/abuse, and the angst of being secretly in love with your best friend. The Reality Subtext also comes into play.
Did Not Do the Research: Jay and Silent Bob's plan to find Shermer, Illinois from John Hughes' films was ultimately flawed because there is no such place.
Y'see, they thought no one in Shermer was dealing, and thus they were going into an untapped market. Assuming Shermer, Illinois even existed, and was accurate to the John Hughes films, they would have been muscling in on Charlie Sheen's turf anyway, as evidenced by Ferris Bueller's Day Off. Plus, they must have missed that long freaking scene in The Breakfast Club where the entire Club, aside from Ally Sheedy, shares some weed. Unless J&SB watched the weed-free TV edit.
Executive Meddling (A rare positive example: the original ending of Clerkshad Dante killed by a robber.)
He definitely wasn't supposed to be there today.
Also, when making Mallrats, Kevin Smith had to fight like hell to keep Jason Mewes in the role as Jay, and it paid off.
The Ghost (Cousin Walter mentioned by Randal and Brodie is the subject of many stories but is never actually seen or heard from in any of the films).
Probably because he died sometime before the films' continuity takes place. Randal's first story about him actually details the events of his death.
Good Adultery, Bad Adultery: Usually played for laughs of the 'ex-girlfriend cheated on the hapless hero' variety - Caitlin cheated on Dante a lot (mostly with painters), as did Gwen with T.S, though Gwen at least seems too feel a bit guilty.
Fanservice: Joey Lauren Adams topless in Mallrats.
Eliza Dushku, Ali Larter, Shannon Elizabeth and Jennifer Schwalbach-Smith in Spycatsuits in ...Strike Back.
Jay doing a Silence of the Lambs tribute striptease in Clerks 2. Sadly instantly becomes Fan Disservice when it cuts to him fully nude and posing like Buffalo Bill, but the start ... Ooh, chapstick.
Salma Hayek playing a muse turned stripper in Dogma.
Ho Yay: Most of the two male platonic couples revel in this. In Chasing Amy, it's actually addressed by the plot; and it's lampshaded in Dogma. Mallrats was supposed to have quite a bit more of this, but Executive Meddling left a lot of it on the cutting floor.
It Will Never Catch On / Vindicated by History (Kevin Smith was told during production of Mallrats that a gag where semen gets stuck in Joey Lauren Adams' hair had to be cut. Because it was gross, would never sell and it would doom the movie, etc. Except for, you know, that other movie that did it three years later and grossed over $350 million freakin dollars.)
Only Six Faces - The small number of actors involved in Clerks caused a live-action version of this trope.
The Other Darrin: Debatable; it has been assumed that the William Black played by Ethan Suplee in Mallrats is the same person as William "Snowball" Black played by producer Scott Mosier in Clerks and Jay and Silent Bob Strike Back, though many have said that they are two different individuals.
Punny Name: In Jay and Silent Bob Strike Back, Federal Wildlife Marshal Willenholly is named for the characters Marshall, Will and Holly on the 1970's children's TV show Land of the Lost.
Shout Out: Even the entries that aren't so over-the-top get their share, like the pastiche of a memorable Jaws scene in Chasing Amy.
A substantial portion of the dialogue in Dogma is either quoted from or referring to several movies and shows, including Indiana Jones, Star Wars, The Karate Kid, and The Six-Million Dollar Man.
Also, Jay and Silent Bob Strike Back is essentially one long parade of cameos, with nearly every single one of them accompanied by a Shout Out to that person's most famous previous movie role. That, and the bong-lightsaber scene.
Look kids, it's Mark Hamill! [applause]
In fairness, he did that because test audiences failed to recognize Hamill.
Thematic Series: The only direct sequel in the series is Clerks II. The rest of the series is loosely knit around New Jersey and the citizens of Red Bank.