At the start of the book Piggy asked Ralph what his name was so it was obvious they didn't know each other. Once Ralph had blown the conch and boys had started to arrive at the platform Piggy asked them for their names, evidence that they were strangers to him. When the choir, led by Jack, arrived Piggy made introductions, which indicated that the boys in the choir didn't know any of the other boys. At the end of the meeting when Ralph, Simon and Jack were heading off to climb the mountain Ralph told Piggy that his job was to collect names. If he'd known the other boys he'd have already known their names.
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The boys where on board an airplane and they were being evacuated away from England which was apparently engaged in some imagined future nuclear war against 'The Reds.' The plane was headed to an unnamed destination. During a storm the plane was attacked and the "passenger tube" was ejected. The "passenger tube" crash landed on the island, leaving the "scar" in the jungle. Large waves, caused by the storm, dragged the "passenger tube" out to sea, along with some boys (and presumably some adults) who were still on board.
Louis Tomlinson of One Direction said as a joke the other boys can not wear stripes. :) If thats what you meant.
the other boys feel like they need to jack in the group. while they are building the signal fire the boys sneak off and go and join Jack's group.
Percival
Instead of going to the other side of island to check the fire the boys want to make a fort. The boys also want to roll rocks.