Remember last season's Lost cliffhanger, in which (sorry, but there's a spoiler coming, so if you don't want to read it, you'd better look away right now) Jack hoped that by detonating a hydrogen bomb on the island, he'd be able to prevent the crash of Oceanic Flight 815? Well, some sharp-eyed viewers spotted a billboard in the background of a scene during the FlashForward season premiere which seems to indicate that's exactly what happened, and have been speculating about it over at the ABC message boards.

More...