Will the clues left behind on the question paper, put Evans back in prison again?

Explanation

Yes they will. Evans escaped from the prison with the help of a clever, infallible plan. Certain clues were left behind by the shrewd fugitive which was a “careless” act according to the Governor. There was a superimposed question paper with directions to the supposed plan. However, it was soon seen that all of it was fake and part of the plan to misguide the officials.
But the little German the Governor knew and the 'correction slip' did help them to track him down.