A ship is passing along the horizon. However the hunters let the fire for when it was their job to keep the fire going. Therefore the ship did not know they were there and by the time they got the fire going again it was too late.
Ralph becomes furious because they could have had a chance to be rescued.
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It is described in a way of animalistic savagery, which, ironically, is what Ralph has been denying throughout the book, but is what in the end leads him to the beach, and his survival.
I don't think that Ralph deliberately lies. I think that Ralph is so traumatised by what he experienced that he finds it difficult to come to terms with it. Ralph does actually say to Piggy things such as you didn't see what they did and it was murder, so he isn't denying what happened, he just doesn't want to relive the experience by discussing it with Samneric and apparently they feel the same way.
a ship
At castle rock, Jack's camp, they saw simons death a whole different way than the other camp. They thought that simon in fact was the beast and the beast can change forms. Ralph's side thought it was murder, because that is a civilized thought, used in court cases. Ralph's side had a civilized way of thinking about it and Jack had a savage way of thinking about it to justify why he killed him.
The littluns' are the younger boys aged around six years old or so, some a little older. They laugh at Ralph because they think he is funny and they are laughing at the way that he is talking in Lord of the Flies.