Just one thing...
At the end of the movie, Stifler brings the band to surprise Elyse. She bursts out and says, "it's not enough that you had to humiliate me at Band Camp, now you set me up here?" and then moments later she thanks the band and Ernie says, "thank him, it was his idea" and she asks Matt, "you planned all this?" She just said "now you set me up here?!" why did she forget that he planned it all?
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Madness is like gravity. All it takes is a little push! — The Joker