- Awesome, Dear Boy: Mark Ruffalo won the role of Chuck Aule after sending Martin Scorsese a fan letter saying how much he wanted to work with him.
- Fake American: British actress Emily Mortimer as American Rachel Solando.
- Release Date Change: It was going to be released in late 2009, presumably submitting it for Oscar consideration. But Paramount were already campaigning for Up in the Air and The Lovely Bones instead - and so it was pushed back to February 2010.
- What Could Have Been:
- The Wolf of Wall Street was going to be made before this. When financing fell through, Scorsese opted to make this instead.
- Josh Brolin and Robert Downey Jr. were considered for the role of Chuck before Mark Ruffalo was cast.
- This was originally commissioned as a directing vehicle for Wolfgang Petersen. However, there were considerable modifications made to Dennis Lehane's novel in order to create a more action-driven blockbuster. David Fincher was also considered to direct, at which stage the film would have starred Brad Pitt and Mark Wahlberg.
- Word of Dante: The film's psychiatric advisor claims that Teddy chose to be lobotomised as Andrew Laeddis, deciding it to be an adequate punishment for his crimes.
- Working Title: Ashecliff.
Trivia / Shutter Island