The black and white picture of the guy on death row in the cabin is the same one used in the original version of this movie (Nattevagten (1994)).
The photograph on the bulletin board at the guard desk that Martin notices when he shows up for his first shift and asks the old watchman about, is a famous photo of Lewis Thornton Powell (also known as Lewis Paine or Lewis Payne), a conspirator with John Wilkes Booth, the assassin of Abraham Lincoln.