The fourth season of "Lost" came to an explosive conclusion last night, and as usual it left its devotees thrilled, bewildered, and scurrying toward Wikipedia. Maureen Ryan of the Chicago Tribune found herself pausing, rewinding, and having “14 different kinds of reactions in two hours.” As promised, the finale saw the rescue of the Oceanic 6, among its other revelations, allusions, and twists. For spoiler-laden commentary, read on.