When Dean and Rory are talking after the hockey game His name is spelled Forrester on his jersey.
While reading the lyrics of a hymn, Dave asks "Is abi~deth a word?" (mispronouncing it as "abba-death"). The word is actually "abideth" (pronounced "uh-BY-deth"), and is an archaic form of the word "abide", meaning to wait, stay, remain or endure).