Lennie: "I got you to look after me, and you got me to look after you" - The fact that Lennie knows this off by heart highlights how important and talked about their dream is.
Lennie: "An' live off the fatta the lan'," Lennie Shouted" - he is excited over his dream of the future - juvenile
Lennie: "Hide in the brush," - this is one of the things Lennie remembers which highlights how important it is and foreshadowing
'Lennie squirmed under the look and shifted his feet nervously' - jittery, juvenile
"'We travel together,' said George coldly." - he is impassive and cool in the face of Curley's aggressive and volatile nature.