Explain the trap Mr. Lyte has set. What evidence does he have? What could happen if Johnny is found guilty?

When Johnny gets there, Mr. Lyte and his relatives make fun of his appearance. They ask to see the cup, and when Johnny takes it out, they accuse him of stealing it from the house last year. Johnny insists that he didn’t, but it’s no use. Even worse, they accuse him of stealing the fancy coat he borrowed from Rab. Mr. Lyte says that Mrs. Lapham has vouched for Johnny’s bad character. The sheriff arrests Johnny and takes him to jail.