What strikes me about this clip (apart from its humor) is Casey’s fundamentally religious intuition: the reason the Green Bay Packers lost to the New York Giants on Sunday is because the ritual guaranteeing success was not followed perfectly—with total purity. Casey’s green jersey needed to be perfect and her nails needed to be perfect (the green not tainted by things like sparkles).
What underlies Casey’s theory of why the Packers lost is akin to the Israelites attributing their exile into Babylon to a failure of sufficiently holding to the religion of Yahweh and the rituals of His temple in Jerusalem. In times of stress, humans often attribute their misfortunes to failures of appeasement—failures to conscientiously please, in every detail, the powers that have overwhelming control over their lives. In childhood, this is mommy and daddy. In adulthood, this is God (or the gods).
In this particular case, Casey was trying to manipulate the magic football-daddy-god that presides over the NFL, the god of Packer fate. But she wasn’t pure enough. Her offering was not received. Her sister Megan, like Eve in the Garden of Eden, tempted Casey away from the ritual purity the god demands, and to catastrophic effect. She is now awash in despair. Her Packers, cast out of Super Bowl contention, are in exile. She turns for comfort to yet another god, Dionysus. Casey’s impious and ironic sister, perhaps an atheist, smirks at her ridiculous and excessive religiosity, but also plays the saintly role of designated driver.