You are supposed to notice the plot, characters, dialogue, and editing. What the fuck are you talking about. Literally anyone can tell Noah Baumbach from Wes Anderson from Paul Thomas Anderson from Scorsese even if they can’t articulate exactly what the difference is. That should deepen your appreciation of the art, not stamp it out!
I’m guessing since he mentione cinema sins it was less about noticing styles and more nitpicking “plot holes” and continuity errors.