The letters "H" and "O" come up several times in this episode. This is interesting because "H" is the 8th letter of the alphabet and "O" is the 15th (815). Charlie first appears to Hurley in this episode near the "Ho-Ho's." When Hurley is in the mental institution "H" and "O" can be seen in the background. Also, when Hurley and Jack play Horse in the gym they stop after Jack gets the first to letters, "H" and "O."