In the scene when Lenny drinks from the stream, he puts his hands in the water, but when he stands up and talks to George his hands and sleeves are dry.
When George and Lenny first arrive at the ranch, Candy quiets the barking dogs by yelling at them. The two in front whimper and quiet, but the third one behind them is still barking despite no sound being heard.
George: Guys like us that work on ranches are the loneliest guys in the world. They ain't got no family and they don't belong no place. They got nothin' to look ahead to...