Was filmed right around the time Liam Neeson's wife, Natasha Richardson, passed away.
Liam Neeson and Laura Linney previously played husband and wife in Kinsey (2004). They also both starred in Love Actually (2003), although their characters never met on screen.
Laura Linney's fourth time sharing screen credits with Liam Neeson. The two have worked together in Love Actually (2003), Kinsey (2004), The Big C (2010) and The Other Man (2008).
The chess opening Queen's Indian Defense doesn't actually involve a queen sacrifice, nor does any other common chess opening.