I believe it was on his first Q&A DVD, An Evening with Kevin Smith (where he also related a hilarious story about filming a bio documentary for Prince). Anyway, the writing process sounds like a convoluted mess: famous ghostwriters who don't want their names associated with shitty script rewrites, people changing a paragraph of dialogue for a writer's credit, third/ fourth/fifth sets of authors on rewrites (ala Superman), etc.

In short: the writing community in Hollywood sounds like a redneck community in Arkansas - everyone is fucking everyone else and no one wants to know or talk about it.