Right after Happy takes his shot in hockey try-outs, when the three teammates dodge out of the way, pause it, then put it into slow-motion. You'll see the coaches standing behind the glass in the very next scene with marks on the glass. When the puck hits the glass, if you look very closely at the glass, you will see the glass shatter where the marks were. OOPS. Gee, who couldn't have called that one??