I love LOST and this was a really good series of shorts. I thought your animations were excellent, really different looking, but done in such a way that you recognise the characters easily, they almost had a Beavis and Butthead feel to them. The hatch was brilliantly drawn.
I thought your music choices were perfect, especially the Mamas and the Papas song, one of my personal favourites. Using the spooky music for the Hurley bird crapping gold was ingenious.
Comedy and dialogue was mostly pretty good, I liked the Teresa falls up the stairs short, and especially the Hurley Bird scene, the timing and the way the characters just stared was hilarious, and then it craps gold and the camera closes in, it was a great scene. The cow on the stairs was a bit boring. The Desmond in the hatch bit, I didn't really understand, but it was quite humourous all the same. The orange dropping out of Locke's mouth was ok, but not too funny. Charlie's knuckle bandages spelling boobies wasn't too funny.
Overall, your strengths are your animation and music choices. Your funnies were not bad, but could be improved. You should make a Lost Shorts Part 2 and I will write you some funnies which will guarantee you laughs.