Focusing on the compass as a symbol for direction, a moral compass, or a sign of things to come is quite interesting.
It was Christian that appeared to Locke and was told to die for the island. I believe it was MiB in disguise as we have seen Christian with Claire gone whako in the cabin AND we now know Claire is in cahoots with MiB (he's her "friend").
I think one non-related LOST happening that had a critical impact was the actor's guild writer strike. This is what made Season 4 come to a screeching halt at 14 episodes and produced shorter seasons of 14 to 17 episodes plus an additional season when LOST was originally suppose to be only 5 seasons long not 6. I believe due to this, the quality of production in the story has been somewhat diluted and is giving us the end product we see. It is still good, but it seems there is consensus in seeing some unanswered questions as well as unpolished episodes.
If you are familiar with the movie CLUE, I would prefer LOST go down the road of the three triology ending pointing out:
- Here's what happened
- Here's what could have happened
- Here's what really happened
instead of doing an alternate reality thing, but I'm not a writer for the show, nor am I part of the 400 crew staff that produces LOST.
Here is wikipedia and look at ending A, B, C if you don't recall or understand.
I could not find a Youtube clip specific to what I'm talking about, but it is a great movie with an all star cast in 1985 (same year as Back To The Future).