The plot is compressed into a single day. The boys get wind of a big party, at which they dream of bedding the only kind of girls who’d ever permit it: really, really drunk ones. “We can be that mistake!” Seth reasons. But to get into the party, they need beer. To get beer, they need a fake ID. And to get a fake ID, they need their pal Fogell (Christopher Mintz-Plasse), the dweebiest of them all, whose phony Hawaii driver’s license claims that his name is “McLovin.” Just “McLovin.” Like “Madonna.” McLovin and a pair of wack-job cops played by “Knocked Up” star Seth Rogen and “Saturday Night Live’s” Bill Hader threaten to take over the movie at one juncture before order is eventually restored. The script, co-written by Rogen and his childhood pal Evan Goldberg, inexplicably sidelines Cera and Hill for long stretches in the middle of the film, and “Superbad” loses altitude whenever they’re gone. But when the focus is on them, they’re a duo for the ages. As a “Revenge of the Nerds” redux, “Superbad” isn’t perfect. But it’s super close.