Just like “Ferris Bueller’s Day Off,” the high school comedy “Easy A” has a random musical number with no real connection to the plot. There’s a lot of borrowing from other coming-of-age movies too, from “Say Anything” and “Sixteen Candles” to “Clueless” and even “Mean Girls.”

The theft pays off because of “Superbad” alum Emma Stone in a breakout role. Fast, funny and devoid of the plastic Hollywood glamour that defines so many in her age group, Stone could be the younger, prettier reincarnation of 80s-era John Cusack.

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