When Hurley is racing through the airport on the scooter, the backs of a girl's soccer team is shown. Their jersey numbers, in order, are 4, 8, 15, 16, 23 and 42.
When Hurley's car breaks down, the km on the counter is 42, temperature 23C, speed 16, then 15, 8, and 4. All of the mystic numbers.
The elevator Hurley tries to go into in the hotel is numbered 23.
Hurley boarded through gate 23 - one of the numbers he used to win the lottery.
When Jack, John, Kate, and Hurley are attacked by the monster, Jack and John drop their packs, not Kate and John. They agreed in the previous episode that the carriers of the dynamite would drop their packs if attacked. A minor foreshadowing to the fact the Jack put the dynamite in his own pack instead of Kate's.