This is the scene in chapter 1 where Lennie and George get to the pond and they drink water. This is also where they have their first argument about how Georges life would be easier without lennie.
This is the scene after George and Lennie meet the boss, and they meet with candy in the bunkhouse. They talk about what work is like, as well as talk about curly.
This is the scene where Carlson wants to shoot Candys dog because he says that it stinks and is old. Candy gets very upset and sad, but it ends up getting done anyways.
This is the scene where Lennie meets crooks and he wants lennie to get out. He reveals that this is because he is black and no one lets him play cards with the white workers.
This is the scene in chapter 5 where Lennie accidentally kills his puppy and is talking to himself about how he thinks George won't let him tend the rabbits. This happens right before Curly's wife comes in the room.
This is the scene after Lennie has hallucinations about his aunt Clara and rabbits. George tells Lennie about the dream they are soon supposed to have and while he is also trying to bring up the courage to shoot him.