 When Andy first gets reassigned to the prison library, the first  officer who comes to him for investment help approaches him by  saying, "Im Dekins." Roger Deakins (qv) was the cinematographer  for the movie. While this is the case, Frank Darabont wrote the  character Dekins into the original script before he hired his crew,  as the same character was in the novella, and the different way of  spelling confirms this.