Again, we see a flashback of Hurley as he tries to get on the plane. And again, his numbers are everywhere: On the panel of his car (42km, 16kph, 23 deg.) right after it broke down, the speed went down 16KPH to 15KPH, then 8KPH and finally 4KPH, so the digital display actually displayed all of the "cursed" numbers.
On the screen of the Oceanic computer: "Arrival 1?:42", the obligatory 815 (flight number), departure 14:15 (hey, that 14 does not fit in there!)
"crazy 8's" on the hat of the old man. A group of (volleball? handball? football?) players with numbers on their shirts: 4, 8, 15, 16, 23 and of course 42, the big sign "gates 14 through 23", "gate 23" and last, but not least: If you look closely, you'll notice exactly 42 people standing in the line where Hurley tries to pass.
After the female sports team mentioned above, Hurley passes a group of 4 Japanese people posing for a photo (he calls "konichiwa" at them, so I assume they are Japanese,) - the person on the front is holding each hand with two fingers up making a V/peace sign, to emphasize the 4.
This last one is a real stretch: Hurley's car has the license plate TX 327. 32 is backwards for 23. The departure time shown on the computer is 14:15 and the big sign says "gates 14 thru 23" - 14 twice. So 14 + 14 = 28, divide 28 by the extra 7 from license plate and you get 4. That's ugly, but you gotta wonder why 14 appeared twice during this scene.