Applying the Theory of Constraints to Communications

I recently finished the book "Velocity: Combining Lean, Six Sigma and the Theory of Constraints to Achieve Breakthrough Performance - A Business Novel" by Dee Jacob. As you may know, I work for a manufacturing company that has successfully implemented lean initiatives. Reading the story I started to make connections from the manufacturing process to the production of marketing communications.

To compare Manufacturing to Marketing Communications:

Order = Request

Scheduling = Prioritizing

Raw Materials = Market research, strategy & positioning

Production = Creative, design and composition

Quality = Edit & approve

Shipping = Distribution

If we choose the Quality/ Edit step as the "Constraint" and this is arguably the most critical stage, how can marketing communications apply lean principals to speed up the process to and from the constraint to maximize throughput?