OK, I re-watched "The End" Saturday night, and I noticed a couple of (admittedly very small) things... so these are just for fun:
1. What was in that black back-pack that MIB wore all the time? The C-4 was already gone, right? His knife was in a holster. What kind of luggage could a smoke-monster
possibly need when packing to leave his home of the past 1000 years? What was so important? A change of socks? (I noticed that UnLocke dropped the backpack when he started his cliffside fight with Jack, and that after "the battle" was over, Ben picked it up when he and Hurley and Jack started off. But then when they arrived at the mouth of the light-cave, definitely none of them had or were carrying the back-pack. Then afterwards, I think I saw it lying on the ground near Jack. Continuity...

2. Why did Kate change clothes in between leaving Jack in the car and going into the church? What, the church has a dress code? And the little black dress was too short or something?
3. Speaking of the car, why is Successful Spinal Surgeon Jack still driving that beat-up POS Jeep or whatever it was? Wouldn't he have a nicer car? I understand that Bearded Druggie Jack might have some financial issues and have that car, but
this Jack?
3. How did Ben get out from under the tree?
4. How did Jack get up from the bottom of the waterfall in the light-cave? When Jacob found his brother draped in the trees after Smokey's creation, I assumed that the body got tossed out/blasted out by the force of Smokey's eruption. But with Jack there
was no Smokey, so how did he get out?
Unless... there
was a Smokey! Dun-dun-DUN!!

(OK, just kidding...)