'Soledad' The area that Lennie and George are travelling in, which means loneliness in spanish.
'Candy lay still staring at the ceiling' When Candy's ancient, ill dog was shot, Candy has nothing left. He delayed killing the dog, even though he knew deep down that it was the best thing, as he dreaded losing his long-time companion. Candy also knew that the fate of his dog was what was destined for him as he was old and would soon be worthless on the ranch. This relates back to the American Dream showing that just one of the groups that didn't benefit from it was the elderly and the weak.
'You got no right to come in my room' Crooks lives in enforced solitude, away from the other men. He is bitter about being a back-busted ******. He is thrilled when Lennie and Candy come into his room and are his companions for a night, but first he is protective over the tiny area that he calls his own, although he knows that he will never own something to himself.