As requested by Mighty Wanderer, here are some additional bits of canon:
In the BFCU, the universe is made of bricks, though not all made of plastic. For instance, the bricks used to make the side of a cliff-face are made of rock, while pieces of a car are metal bricks. Nobody really questions how or why the universe is made this way, but some scholars believe it was constructed by an ancient race known as the Celestial Builders.
A minifigure’s life-force is known as the Creation Spark, like in the LEGO Universe game.
Minifigures see themselves as all one piece, so in order to put on clothes, they are just seen to go on top of the minifigures body (even though when animating, you would exchange the plain yellow torso for the clothed torso). This avoids any weirdness of a minifigure disassembling him/herself. The same goes for headwear - the hair still exists underneath.
"Nothing goes down 'less I'm involved. No nuggets. No onion rings. No nothin'. A cheeseburger gets sold in the park, I want in! You got fat while we starved on the streets...now it's my turn!" -Harley Morenstein
