The most interesting comment to me was when False Locke said something to Richard along the lines of "seeing you without your chains". Since he's also apparently as un-aging as Jacob and Jacob's Nemesis, well, it seems they have an interesting back story to explain there.
Remember, the Black Rock had a number of Slaves aboard when they found the Island, as demonstrated when the Survivors find the vessel in Season 1. I believe Richard was a slave aboard the BR, but was a 'good' person, so Jacob freed him, and gave him eternal life.
Perhaps Richard could have won eternal life as part of the game Jacob/MIB seem to be playing.
This is an alternate timeline, not the one we have seen. There are differences in this timeline, as noted in last night's episode (no wing outside Jack's seat window, Cindy only giving him one bottle instead of two, the conversation between Jack and Rose was different, etc.) This timeline is what happened as if the bomb went off - this is the aftermath of jughead. Jughead going off caused the island to sink in 1977. This means that everyone on the island sunk - including Widmore (as he was the leader of the Others at the time). Which means no race around the world for Desmond to participate. Who's to say he wasn't just in Australia? I mean I think there's going to be a reason for him being on the plane but it's not a stretch to say that he happened to be on the plane.
When the Plane flies over the island, the island is under water. Desmond landed on the island during a sailing race. If the island is under water, the boat never hit the island and finished the race. Whidmore wasn't looking for the island anymore and Penny and Desmond live happily ever after...
So, by this logic, if the bomb goes off and sinks the Island, Daniel Faraday and Penny Widmore would never be born, as Ellie and Charles would probably have died. I believe Ellie was pregnant with Faraday at the time of the explosion, and this was well before Charles had Penny.
BTW: Did anyone notice that Walt and his dad didn't make a single frame in the pre-season premiere episode?
Yes, this really stuck out to me. Walt has been in just about every season premiere and finale. It was a very interesting omission, one I think they did intentionally - keep him out of our minds until midway through this season when he makes his epic return to the Island.
Edit - this could have been unavoidable - Malcolm David Kelley (Walt) is now 17, so he would definitely stick out playing a 10 year old.
to tell you the truth im done trying to theorize about this show. some of what i have predicted has come true but most of it hasnt. its too stressful haha. im just going to see where the show takes me.
Seriously. At this point, I am sitting back and letting the Island tell me what happens next. One of the reasons why LOST is so popular is because we could sit here and theorize all day, but in reality, there's just so many directions the show can take.