Heterochromia iridum
I was doing a little research into people with Heterochromia iridum, and came across a list of actors. There aren't many actors with hetrochromia Eyes, only about 20 or so actors.
On that list was Christopher Walken and Jane Seymour, and then I remember that in this movie they played Husband and Wife. Was this just a freak coincidence? Because obviously there is no reference to it in the film. I thought it was an interesting coincidence that I wanted to point out.
Also on the heterochromia iridum Actor's list were Star Trek Into Darkness actors: Simon Pegg, Benedict Cumberbatch, and Alice Eve.