Something that was neat was that the funeral parlour Jack visits is Hoffs/Drawlar whicj is an anagram for "flash forward," which was cool.
I think the prevailing theme was controlling outcomes versus resignation to one's fate. I hate to see Jack so fucked up, but maybe that is just one possible outcome, similarly to Desmond's deja vu episode from the start of the season.
I loved seeing Hurley flying out onto the beach in the van - it was like Han in the Falcon suddenly swooping in to save the day.
What a great show...