Towards the end of the movie, there is a scene where Azreal has the good guys in a bar, waiting for the end to come. The good guys are all sitting in chairs, watching him talk. Keep your eyes on Jay. He starts to fall asleep, then he is asleep. Then he's awake, and asleep again.
But this being a Kevin Smith movie, it's pretty typical of his style of humor to have silent Bob do something like that. I guess you could say it's bobbish :)
Actually, it wasn't Silent Bob, it was Jay. And, it shows Jay falling asleep. In the next shot, he doesn't wake up, he just scratches his nose. This isn't a slip-up at all, it's a joke they put in since it's a COMEDY.