For those of you who haven't been following the alternate reality game "Find 815" these past few weeks, here's the 2-video catch-up.
Remember how in Season 3 Naomi said the wreckage of Flight 815 had been found at the bottom of an ocean trench? Yes, it doesn't make sense at all. The "Find 815" game's end-video echoes Naomi's comment. Of course we don't know yet if the content in this video will be completely canonical or officially in line with the episodes to come, but if you're extra sensitive about spoilers you can decide yourself if you wish to view it.
And next, here's the Oceanic Air "golden pass" television ad that aired after Lost (during Eli Stone). You should recognize the interloper from the previous video, Sam Thomas, the protagonist of the alternate reality game.
Finally, if you want a more in-depth view of the "Find 815" video storyline, the chapters have been compiled on youtube: