“The statisticians who compare domestic openings have refined their comparisons; three-day weekends, four-day holiday weekends, etc. are all clearly delineated. But the definition of worldwide day-and-date openings — with different countries debuting movies on different days of the week — has yet to be fully outlined. The intense focus on worldwide openings also obscures how movies have been doing in subsequent weeks domestically, where the competition has been a lot tougher than it has been abroad.”