Jay and Silent Bob Strike Back is the silliest movie Kevin Smith has made to date. He took his secondary characters, wrapped up a number of loose ends, stirred it all together, stripped all the smart dialogs from the resulting mix, and made a script out of it. You can still find a number of social commentary aimed at Hollywood in it, but the just of the flick aims at turning off your brain.
The best joke of the bunch is making the fake film into a a sort of Star Wars parody and have Mark Hamill play the villain. I will also mention that Carrie Fisher has a small role in there somewhere, just to make the whole thing even more meta. Actually, Smith makes the whole thing so meta that he has to laugh at himself by making the actors look pointedly at the camera.
This production is star studded with the likes of Wes Craven, Shannen Doherty, Jason Biggs, James Van Der Beek, Gus Van Sant, and that's just naming a few.
If you like what Kevin Smith does, and know his universe, you will appreciate it.