Toward the end of filming Zac Efron had appendicitis. It started out as a stomach ache but he had it checked out that night after filming and he had surgery that same night.
Shipped to theaters under the code name "Rewind".
Thomas Lennon advised Zac Efron that his appendicitis was in fact bad wind, and advised him to hang upside down to cure it.
Zac Efron called Matthew Perry for help on his lines and mimicking some of his movements to give a more authentic performance.
When Ned Gold goes to meet the principal for the second time, he is dressed up flamboyantly and he called it "peacocking". This is a tongue-in-cheek reference to Pick Up Artists.
Both Mike and Alex wear the number zero on their uniforms.