When Justice asks Jay what "snoogans" means, he says it means, "I'm kidding." This is true: Jay's odd catchphrases evolved from random vocalizations Jason Mewes would make as a teenager whenever he'd jokingly say something nasty (i.e., "I just fucked your mom! Nooch!").
Shannon Elizabeth added the idea of Justice being nearsighted. Why? Because "Justice is blind."
Billing Displacement: Jason Mewes is billed fifth on the poster and Kevin Smith isn't billed at all, despite the fact that they are the stars of the movie.
In fairness the six names on the poster are in alphabetical order by last name, and Smith would be the seventh. Also, as he is the writer/director, (a) his name is on the poster in that regard, (b) it could be modesty, and (c) it might be the joke—that Jay and Silent Bob's actors can't even get top billing in their own movie. Also, he may be one of the two title characters, but he has the fewest speaking lines of the seven.
Defictionalization: Moviepoopshoot.com was live for a while, and posted new content after the movie's run. It was later Quick Stop Entertainment, tying in with the c-store of the narrative of the saga (it's now called Fred Entertainment and is owned by Ken Plume, editor in chief of the former Quick Stop Entertainment). Brodie's comic shop is actually Kevin Smith's, in Red Bank, New Jersey.
The Russian website kino-govno.com borrows its name from the Russian Woolseyism-laden translation's rendition of Moviepoopshoot.com (the title literally means "film-shit.com"). The site's creators are self-confessed huge fans of Kevin Smith.
Doing It For The Fans: Kevin Smith has gone on record saying the movie is a love letter to the fans after all the years of support for his work, which is why he tried to work in as many references to all previous films he could and centered the entire movie around Jay and Silent Bob in the first place.
Subtler is Matt Damon referencing Dogma as a film that he and Ben Affleck were in, even though the events of that film happened to characters within this one.
Production Posse: Since this was going to be the last View Askewniverse film, Kevin Smith got pretty much everyone who had even a minor role in the previous films to come back and at least make a cameo.
"Hey kids! It's Mark Hamill! (Applause)" No really, test audiences had no idea who he was under all of the costuming, as well as the fact that he hadn't been in a live-action movie in years.
Jay stopping the fight with the Cock-Knocker to take a hit on his bongsaber was an idea Jason Mewes came up with during rehearsal.
Troubled Production: On his podcast Jay and Silent Bob Get Old, Kevin Smith went on at length about how much of a headache this movie was, mostly owing to Jason Mewes' drug and alcohol abuse turning him into a "ticking time bomb" which threatened to shut the project down at any moment. During pre-production, Mewes would have constant mood swings due to heroin withdrawal, to the point that Smith actually threw him out of his car on their way to the set one day. Mewes would compensate for his lack of drugs by drinking heavily after every day of shooting and nearly got into a fist fight with Scott Mosier when he had to come back one night for a reshoot while drunk (Mewes later said that he was too intoxicated to remember anything that happened during production). When the shoot wrapped, Smith told Mewes point-blank to get sober or he'd never speak to him again. This is partially why he eventually decided to do Jay and Silent Bob Reboot, because he wanted to have better memories working with Mewes than he did on this film.
Unintentional Period Piece: The film references works from multiple decades, though the early to late 90's are treated as being recent, with movies from the year 2000 being the most topical. The ''DaredevilEarly-Bird Cameo references a movie that had not yet been released at that time.
Justice's introduction was originally going to be scored to the Prince song "The Most Beautiful Girl In The World," but the Purple One refused to license it (though he still gave permission to use Morris Day and The Time's "Jungle Love"). Smith approaching Prince for the rights led to him getting hired for the notorious unfinished documentary described in An Evening with Kevin Smith.