Is it okay if I bypass Will Gluck‘s Easy A (Disney, 9.17) and proclaim Emma Stone as the next big thing — a sassy Michelle Monaghan-resembling actress-comedienne in the Elaine May-Eileen Brennan mold — on the strength of this trailer? Or do I have to actually go to this afternoon’s 4 pm screening and sit through it? Because the trailer makes me feel as if I’ve pretty much seen it.