Soledad, the town they was in at the start in Spanish means solitude and loneliness.
Mentioning this always seems to be worth a few marks as people often forget it.
Maybe you could mention that Lennie and George started in loneliness and solitude and ended alone, in solitude: this is writing technique in which the writer goes full circle etc etc...
Has your teacher told you what are the likely questions you will be asked? From what I remember, most teachers could easily predict what questions would crop up.