The theme of holes is the consequence of choices resulting from fate and destiny and the importance of friendship
This shows that the friendship between Stanley and Hector is important because if Stanley wasn't friends with Zero, Stanley wouldn't have been released from the camp.
It's got his name on it. See, Stanley Yelants.
This shows that Zero is the reason Stanley was sent to Camp Green Lake. That means that fate made Zero and Stanley.
I stole Clyde Livingston's Shoes.
This shows that the friendship between Hector and Stanley is special because Stanley can not leave the camp without Hector.
I'm not leaving without Hector!
This shows that Stanley was concerned for Zero so Stanley steal the water truck, but crashes it into a hole.
This shows that it was fate for Zero and Stanley to meet because Zero stole Clyde Livingston's shoe and set them on top of a car, they blew off and hit Stanley in the head. Stanley was arrested that day and Zero was arrested the next day.