At the Power Lunch, the Check Is Kryptonite By LAURA M. HOLSON ON a recent Monday night, Christine Peters, a producer of “How to Lose a Guy in 10 Days,” tucked into a corner booth in the Polo Lounge at the Beverly Hills Hotel with a fellow producer and an actress. They chattered about a possible film for an hour or so before Ms. Peters excused herself to go to the ladies’ room. When she returned, she noticed a thin leather case sitting on the table, with the check inside. “Did anybody get this?” she asked. Both women stared blankly,...