George and Lennie are sitting around a fire and talking about going to a farm to make money and eventually have there dream become a reality of having there own land and being able to live off it.This shows that they don't have a home and are poor.They trying to make enough money to be able to have there dream come true.
George tells Slim the story about Weed. Lennie sees this girl with a red dress and tries to pet it but when the girl screams he gets scared and doesn't let go of the dress.The girl then told the town that she was raped and they were chased out of weed.This shows that Lennie may not be very bright,also that Lennie always causes trouble for George.
Lennie was petting the pup too hard and killed but then Curley's wife walks into the barn.She ask Lennie to pet her hair but when he does and she tells him to stop he doesn't and she tries to free herself and Lennie snaps her neck accidentally.He knows he's done something bad and goes to hide.George warned Lennie to stay away from her because he knew she would cause trouble.However Lennie didn't listen and killed her!
Lennie is waiting for George and is talking to himself about how much trouble he has caused for George.As he is doing that a water snake slithers by.The water snake shows that as a result of working at the farm they really haven't gotten any closer to accomplishing there dream.This shows that people can have dreams but bad decisions/mistakes can ruin those dreams.