George discusses how he and Lennie travel together. Slim, the most reasonable man on the ranch, accepts this and a subtle bond is formed between he and George. This will become a factor at the end of the story when Slim understands what George must do to Lennie.
George tells Slim what happened in Weed and why he and Lennie had to flee from that job. There is no overt foreshadowing here, but the suggestion is proposed to the reader that Lennie has a propensity for getting into trouble and subsequently losing jobs. This raises tension and suspicion about what will happen to Lennie at this particular job.
Carlson insists that Candy's dog should be put out of its misery. Candy refuses but eventually gives in. Candy, like his dog, is old and not of much use as a worker. However, he does offer $350 to Lennie and George to help establish their own farm. George reluctantly agrees, making the possibility of this dream a little more likely. Anticipation rises as the reader considers whether their dream of a farm really is a possibility. Candy also mentions that he should have shot his dog himself. This will parallel what happens at the end of the story with George and Lennie.
When Lennie destroys Curley's hand, it appears as though he will lose another job, through no fault of his own. But the other workers threaten Curley and Lennie is left alone. This increases the tension between Lennie and Curley. It also shows how unwittingly destructive Lennie can be when he is pressured or attacked. In short, if the tension increases for the reader, the foreshadowing and opportunity for something dangerous increases as well. If tense situations become more likely for Lennie, destructive outcomes also become more likely. The only thing balancing this destructive possibility is the idealistic dream of the farm.