In the montage sequence showing Drew Barrymore hanging out with the math club, they have a Pi poster with 3.1457869986. Only the first 3 digits are actually correct. (Pi = 3.1415926535897...)
At the prom, the popular girls tell a couple that there's "no room" at their table. The couple is dressed like Mary and Joseph of the Bible, whom were told there was "no room" at the inn (and therefore had to give birth to Jesus in a stable).