This script is a mess, and could afford to lose at least 45 minutes, which is how long it takes before you actually discover there is a story and not just more hemming and hawing over will he or will not he finally pop the question to Mary Jane Whatserface, played by a devotee of maryjane, the loverly Kirsten Dunst.And when a film becomes excessively self-referential, basking in its own commercial su