Every box-office analyst agrees: the Memorial Day holiday debut of Indiana Jones and the Kingdom of the Crystal Skull is going to be enormous. The only remaining question is whether it will be more enormous than Spider-Man 3, which opened In May 2007 with a record $151.6 million. The film is opening in 4,206 theaters domestically and in 61 other countries. The worldwide result could be as much as $400 million, a few analysts are predicting. But then again, the track record of box-office forecasters has been dreadful during the past few weeks.