During the episode "Exodus--Pt. II" there are several references to the "special" Hurley numbers. First go to 52min18sec into the show. When Hurley is leaving his hotel room, you can freeze frame on the door--it's room 2342. Now, go to 52min50sec and when Hurley's car starts to break down, the instrument panel shows 42 on the trip meter, 23 degrees celcius on the thermometer, 16kph on the speedometer. The speedometer then slows to 15kph, then 8kph, and finally 4kph. That's 4-8-15-16-23-42, ALL of the "special" Hurley numbers.