Shutter Island

I recently went to watch the movie Shutter Island and I was very impressed with the film due to the twist in the end but I thought it was predictable that Teddy the main character was the 67th patient in the mental institute. The storyline and the actors were amazing throughout the film I felt many emotions such as confusion, fear and suprisment
I originally thought that they're continuity errors like when Teddy was taking drugs with a glass of water but in the next shot the glass was not there though due to the twist in the end it was him thinking that he was doing it. I loved that the memories of Teddy was mixed within the film when Teddy was dancing with his wife and he dreamt she was soaked which in the end turned out to be that she drowned her children, bleeding in her stomach as she was shot and the ashes as he believed she died in a fire.
I was confused during the film because I did not know whether the workers played to be the patients, there was a continuity error as when he swam to get his daughter who had drowned and bought her on to land and laid her down which was a wide shot,then the next shot was a close up and then the camera was a wide shot again and the daughter arms were crossed on her chest however Teddy did not cross them and I did not understand the ferry in the beginning did Teddy make it up or did they go on to a ferry.
The film is very clever which makes the movie so intriguing as Teddys name was made up and it was anagram of the murderer and during the film I was terrified at the tunnel scene as it was dark and the audience was waiting for some one to jump out and the camera was hand-held during the films which was shaky which intensified the scene,
I thought the ending of the film was brilliant as the death of Teddy is implied "Would you rather live as a monster or to die as a good man". I recommend the film to anyone as it was a great thriller and it had the audience thinking the whole way through the movie.