Character mistake: Ben Kingsley is Dr. John Cawley. But he is called Steven when the doctors are grouped together discussing how to handle the patients due to the hurricane, right after the graveyard scene.
Other mistake: During the flashback of the soldiers executing the Dachau guards, the soldiers are in a line opposite the guards who are in a line against a fence. The soldiers all start shooting at the same time, but we are shown the guards being mown down by gunfire in succession, like dominoes, rather than simultaneously.
George Noyce: Don't you get it? You're a rat in a maze.
Trivia: During the ferry approach at the start, we are shown Shutter Island. In actuality this is a combination of Peddocks Island (the decaying brick buildings), Maine's Acadia National Park, Massachusetts' Medfield State Hospital, and Turner Hill Country Club's Rice Estate (located in Ipswich, MA), which were combined via CGI. Additionally, the mountainous region of the island (shown as the ferry approaches) was also CGI, and added in post-production.
Question: Why does Teddy have a cut with a plaster (band-aid) on his forehead throughout the film?
Answer: He was in an altercation with the patient in ward C prior to returning to ward C and talking with him again. It was an injury sustained in the past due to that.
Answer: The bandage is a symbol indicating when and when not Teddy is caught in his delusions. When the bandage is on he is delusional, thinking he is the marshal finding out all the dark secrets of the facility. When the bandage is absent he is lucid and aware of his past crimes and his own delusions.
Wrong. It's on the whole movie until he takes a shower. The bandaid is off but yet that's the scene where he runs in the lighthouse thinking he's the Marshall still. Did you watch the movie at all?