I've mentioned this before - if the Numbers from 'Lost' showed up in the lives of the characters from the show all through the world, then it stands to reason that they would show up in the lives of characters from other TV shows which share the same TV Universe.
We've seen the full sequence happen already with a fortune cookie message in 'Veronica Mars', but there have been many other examples of individual numbers from the sequence in other shows like 'Heroes', 'The X-Files', and of course, 'The Hitch-Hiker's Guide To The Galaxy'. The sequence of the Numbers is 4, 8, 15, 16, 23, 42. And the latest episode of 'Journeyman' had one of those numbers get displayed prominently. Here we see "23" as the ambulance number, with Dan leading the way into the hospital. Since the Numbers apparently have such power, it can only mean that Dan is due for a momentous turn of events.....
And as he travels through Time, I suppose that's a given.