Pixar’s “Up” opened with $68.2 million, at the upper end of expectations. It’s Pixar’s third best opening after “The Incredibles” and “Finding Nemo,” which both bowed around $70 million. The weekend’s other opener, “Drag Me to Hell,” opened below expectations with $16.6 million, in third place behind holdover “Night at the Museum: Battle of the Smithsonian,” which managed $25.5 million in its second weekend.