“Amsterdam,” a new historical mystery from “Silver Lining’s Playbook” and “The Fighter” director David O. Russell is here. And if the marketing material has been more than a little confusing (because, admittedly, it has been), we’re here to clear up all of your questions – what the movie is, where you can watch it and who is a part of the unstoppable, all-star cast.Read on for a definitive cheat sheet on one of this year’s more star-studded films.It is in theaters, exclusively, starting October 7.