John mentions it when referring to the mnemonic device Roy G. Biv, used to remember the sequence of hues in the visible spectrum; red, orange, yellow, green, blue, indigo, violet.
Dr. Jordan says "thirty seven," when Michelle gets 37 points playing Scrabble. This is a reference to the iconic scene in Clerks in which Brian O'Halloran playing Dante has a conversation with his girlfriend about the number 37.