I've watched the last episode a few times now and I've always liked the way Lost has hinted at certain things by the use of symbolism and subtle visual clues to the viewer right from the first episode, causing an air of intrigue and mystery followed closely by huge on-line conjecture and speculation whilst being mainly ambiguous which some will argue has been part of its success over the last 6-years.
I see a lot of fans have read far more into the ending than others and 'understand' it all finally, while other fans are still as confused as ever. I find it quite fitting that during the final episode there was a small scene dedicated entirely to a 'Quick Fix', a 'Botch Job', I refer of course to the Duct Tape scene, a quick emergency measure that will get you through a tight spot when you don't have the correct measures to do things properly, just this small scene summed up the Finale for me.