What does bud do that shows he cares about Mr. calloway in chapter 19?

When Bud tells Mr. Calloway that he thinks Calloway is his father, Mr. Calloway yells at Bud, calls him a liar, and wants to bring him immediately back to the orphanage. Ultimately he allows Bud to stay temporarily, but he sternly warns Bud that he better not touch anything in his house.